You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Could you please assist me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Robert Martin.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Robert Martin, we haven't found any reservation under your name in our database?

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.