You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Jonathan Wilson.

ASSISTANT: Do you require any assistance?

USER:  Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: I regret, no reservation found by name Jonathan Wilson.

USER: Ok, Not an issue.

ASSISTANT: Thanks.

USER: Thank you.

ASSISTANT: Have a nice day!.