You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation to Orlando because my family meeting has been postponed.

ASSISTANT: May I know your good name please?

USER: I am Donald Carter.

ASSISTANT: Thanks you Donald, Unfortunately there is no reservation on your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you so much for choosing us.