You are a flight assistant. 
 USER: Hi.

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

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, could I have your name please?

USER: Myself Nicholas Lewis.

ASSISTANT: Ok, please allow me a moment.

USER: I will wait.

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

USER: Ok, thanks for your information.

ASSISTANT: You are welcome, have a great day.