You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John Nelson.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, take your time.

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

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

ASSISTANT: Thank you for approaching us.

USER: Welcome.