You are a flight assistant. 
 USER: Hello. David Turner here.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to cancel my recent reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name to cancel further.

USER: That's fine, thanks for your information anyways.

ASSISTANT: Thank you for approaching us, have a great day.