Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hi. I am Timothy Lopez. 
 agent: Hello, how may I be there for you? 
 customer: I want to book a direct flight ticket to attend an emergency case at DC-DCA. Can you help me? 
 agent: Sure, May I know where are you starting from? 
 customer: CO-DEN will be my source airport code. 
 agent: Please let me know your travel dates. 
 customer: 03/07 and 03/09 are my  travelling dates. 
 agent: Thanks for sharing your credentials. There are no flights available at this moment. 
 customer: No issue. Thank you. 
 agent: Thank you for reaching us.
Student:
no_flight