You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Thomas.

ASSISTANT: How may I assist you?

USER: Owing an emergency, I want to cancel my recent flight ticket reservation. Can you help me in this?

ASSISTANT: Sure, please wait a moment.

USER: Ok, take your time.

ASSISTANT: David Thomas, there is no reservation on your name.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you so much.