Detailed Instructions: 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
Q: customer: Hi. 
 agent: Hello. How may I serve you? 
 customer: I need to cancel my reservation right now because I am unable to reach airport due to an accident happened. 
 agent: Ok. 
 customer: So, please help me with this. 
 agent: Sure, I will help you. Let me know your name. 
 customer: Thank you. My name is Thomas Hall. 
 agent: Please, wait. 
 customer: OK. 
 agent: Thanks for waiting. There is no reservation found on your name. 
 customer: Ok, no problem. Thanks for the information. 
 agent: Thank you.
A:
no_reservation