In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details

Input: Consider Input: customer: Hi. 
 agent: Hello. 
 customer: I am Mary Brown. 
 agent: How may I assist you? 
 customer: I would like to visit Oakland California temple on Aug 17. Can you help me in booking a flight ticket? 
 agent: Sure, I will help you. May I know your source airport code please? 
 customer: My take off airport code is IAH. 
 agent: Do you have any plans on your return journey? 
 customer: Yes, I intend to return on Aug 19. 
 agent: Do you have any specifications? 
 customer: There should be a lay by in between my journey. 
 agent: Mary Brown, no flights has been found on your planned travel dates. 
 customer: Ok, I will check with another agency. Thank you for the information. 
 agent: Thank you for choosing us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Christopher Taylor. 
 agent: How can I help you? 
 customer: I planned to meet my cousin in DCA, can you please help me to book a flight ticket from PHL? 
 agent: Sure, can you please tell your travelling dates? 
 customer: I planned to travel on 02/18 and 02/20. 
 agent: Sorry, there are no flights available with your requested details. 
 customer: Ok, no problem. Thank you for your time. 
 agent: Thank you and have a nice day.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I guide you today? 
 customer: Can you please help me with booking a flight ticket from LGA to BOS? 
 agent: Can you please share your travelling dates? 
 customer: My travelling dates are from Mar 29-31. 
 agent: Do you have class preference? 
 customer: I am comfortable with any class. 
 agent: Do you need connection limit? 
 customer: I prefer to fly in direct flight. 
 agent: May I know your name? 
 customer: Patricia Scott here. 
 agent: Sorry, no flight found in that route. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Output: no_flight


