Instructions: 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: Hi, I am Andrew Perez. 
 agent: Hello, How can I serve you exactly? 
 customer: To participate in soft adventure sport at Oakland,CA - OAK. Can you help me to book a connecting flight? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Provide your travel dates please? 
 customer: I want to fly on 10/02 and recur on 10/04. 
 agent: Where is your origin airport? 
 customer: I want to board from Denver, CO - DEN. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent:  Thanks for waiting, there are no flights available at this moment matching your particulars. 
 customer: Ok, no issues. Thanks for your help. 
 agent: Thanks for your presence.
Output:
no_flight