You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you with that. Can I have your good name please  to check your reservation status?

USER: My name is Sandra Scott.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry Sandra Scott, no reservation has found under your name to cancel.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you  for choosing us.