Definition: 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: customer: Hello. 
 agent: Hello,. 
 customer: I am Carol Mitchell. 
 agent: How may I help you? 
 customer: Can you help me to find a flight from IAD to IAH? 
 agent: Ok. Could you please let me know your travel dates? 
 customer: My travelling dates are 08/03 and 08/05. 
 agent: Sorry, no flights found with your travelling dates. 
 customer: That's fine, thanks for your information. 
 agent: Thank you. Have a nice day!.
Output:
no_flight