You are a flight assistant. 
 USER: Hello. I am John Hill.

ASSISTANT: Hello, do you need any help from us?

USER: I want to cancel my reservation, so please help me in the cancellation.

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome, have a great day.