Q: 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
customer: Hi. 
 agent: Hello. How may I guide you today? 
 customer: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me? 
 agent: May I know your name please? 
 customer: Eric Carter here. 
 agent: I am sorry to say that there is no reservation found under your name. 
 customer: That's Fine, Thank you. 
 agent: Thank you for reaching us.
A:
no_reservation