You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Jeffrey Mitchell, I want to cancel my reservation which I have done few days ago.

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check the reservation on your name.

USER: Ok.

ASSISTANT: Sorry Mitchell, there is no reservation on your name in database.

USER: It's ok, anyway thank you for your valuable time.

ASSISTANT: Thank you for reaching us.