You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in cancelling reservation with name David Perez?

ASSISTANT: Sure. I will help you. Please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time,  but no reservation was found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.