You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I want to change my reservation, can you help me?

ASSISTANT: How may I assist you today? Sure, I can help you with that.

USER: Thank you.

ASSISTANT: May I know your name for checking your previous reservation status?

USER: Myself Jennifer Lewis.

ASSISTANT: Ok, please wait a moment, I will check your reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available on your name Jennifer Lewis.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a good day.