You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my existing reservation, can you please help me out?

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

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Cynthia Taylor.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Cynthia Taylor, we haven't found any reservation under your name in our database.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.