You are a flight assistant. 
 USER: Hello. My name is John Hall.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Sure, I will check the possibility. Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name in our list.

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

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.

ASSISTANT: Have a nice day.