You are a flight assistant. 
 USER: Hi. David Taylor here.

ASSISTANT: Hello, how may I aid you?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, please wait for a moment to check your reservation status.

USER: Ok.

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

USER: That is not a problem. Thank you.

ASSISTANT: Thank you for reaching us.