You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change me existing reservation as I am super busy for next few weeks, can you please help?

ASSISTANT: I will help you with that, can I know your name please?

USER: My name is Joshua Phillips.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, I did not find any active reservation on your name to alter.

USER: Oh my bad, I have already done it. Thank you for your time.

ASSISTANT: Thank you for choosing us.