You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: To proceed further, May I know your name?

USER: I am Nicole Thompson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for approaching us.