You will be given a definition of a task first, then some input of the task.
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

customer: Hello. 
 agent: Hello, how may I support you? 
 customer: I want to attend auto show ,can you please help me in booking? 
 agent: Sure, can you please provide me your travelling details? 
 customer: My airport codes are from ORD to PHX. My travelling dates are from 07/04 to 07/06. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: To proceed further, may I know your name? 
 customer: I am Jeffrey Lee. 
 agent: Thank you for being patience. Unfortunately, there were no flights on your preferred dates. 
 customer: Ok,No issues. 
 agent: Thank you for reaching us, have a good day. 
 customer: Thank you for your quick response.
Output:
no_flight