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. 
 customer: Myself Angela Mitchell. 
 agent: Angela mitchell, how may I aid you? 
 customer: Due to some problems my trip was cancelled so can you please cancel my flight ticket? 
 agent: Sure, please give me a moment to check your ticket status. 
 customer: Ok, thank you for your response. 
 agent: Sorry, no reservation is available by your name. 
 customer: Oh! It's ok no problem. Thank you for your information. 
 agent: Thank you for reaching us.
A:
no_reservation