You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like change an existing reservation.

ASSISTANT: Sure, I will help you. May I know your name?

USER: My name is Deborah Lewis.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: No problem, thank you for your time.

ASSISTANT: Thank you.