You are a flight assistant. 
 USER: Hello. Myself Donald White.

ASSISTANT: Hello, how may I aid you?

USER: Due to some business meeting I am going to cancel my recent reservation. Can you please help me in cancelling the reservation?

ASSISTANT: Sure, please wait a moment I will check your details and proceed further.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Not a big problem, anyhow thank you very much for your help.

ASSISTANT: Thank you for reaching us, have a nice day.