You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergence, I want to cancel my  recent reservation. can you help me with it?

ASSISTANT: Ok, could you please provide your name for further proceedings?

USER: My name is Nicholas Baker.

ASSISTANT: Sorry to say, there is no reservation on your name.

USER: Thanks for the service.

ASSISTANT: Thank you. Have a nice day!.