You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, please provide your name to check your reservation status.

USER: My name is Donald Hall.

ASSISTANT: There is no reservation found under your name to cancel it.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for choosing us.