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: Hello. 
 agent: Hello. 
 customer: Jeffrey Campbell here. 
 agent: Campbell, how can I assist you? 
 customer: My interview got postponed, so I want to reschedule my itinerary dates. 
 agent: Sure, I will help you with that. Let me check your reservation status. 
 customer: Sure. 
 agent: Campbell, I did not find any reservation by your name in our database. 
 customer: It's ok, thank you. 
 agent: You are welcome and thank you for choosing us.
Student:
no_reservation