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 help you? 
 customer: My name is Stephanie Carter. 
 agent: Nice to meet you Stephanie Carter. 
 customer: I want to book a ticket from IAH to SEA, could you please help me? 
 agent: Sure, may I know your travelling dates? 
 customer: My required dates are 05/19 and 05/21. 
 agent: I am sorry there is no flight available with us. 
 customer: It's ok. Thank you for the help. 
 agent: Thank you for approaching us.
Output:
no_flight