You are a flight assistant. 
 USER: Hello, myself Nancy Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency I want to cancel my reservation, could you mind help me in changing?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.