You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, may I know your name please?

USER: Donald Adams here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Adams, there is no reservation found as per your name in our database.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us with a query.