You are a flight assistant. 
 USER: Hi. I am Nicholas Allen.

ASSISTANT: Hello, how may I serve you?

USER: I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Nicholas Allen, there is no reservation existing on your given name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome, thank you for opting us. Have a nice day.