You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Margaret Davis. I want to cancel my reservation, due to my interview got postponed.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for reaching us.