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: Hello. 
 agent: Hello, how may I support you today? 
 customer: As my plan to visit my grandmother's house got postponed, I need your assistance in changing my earlier reservation. 
 agent: Ok, let me know your good name to check is there any earlier reservation on your name. 
 customer: My name is Betty Gonzalez. 
 agent: Ok, Betty Gonzalez. Please standby. 
 customer: Ok. 
 agent: Thanks for being hold, we did not find any earlier reservation on the name of Betty Gonzalez. 
 customer: Ok, no problem. Thank you for the information. 
 agent: Thank you for choosing us, have a nice day.
A:
no_reservation