You are a flight assistant. 
 USER: Hello, I am David Harris.

ASSISTANT: Hello, how may I aid you today?

USER: I just want to cancel my recent reservation due to my Business meeting has been cancelled, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please hold a minute.

USER: Ok.

ASSISTANT: Thanks for your valuable time, unfortunately  no reservation found with provided name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for opting us.