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. 
 agent: Hello. How may I help you? 
 customer: Please help me out in booking the ticket from MSP to PHL. 
 agent: May I know your travel dates? 
 customer: My trip dates will be Jan 29 to Jan 31. 
 agent: Do you have any connecting preferences? 
 customer: I need a connecting flight. 
 agent: Is there any other concern? 
 customer: No. 
 agent: May I know your name please? 
 customer: Patrick Lewis is my name. 
 agent: Sorry, no flights found at the moment as per your desired locations. 
 customer: That's ok, thank you. 
 agent: Thank you for choosing us.
Student:
no_flight