You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Elizabeth Young.

ASSISTANT: Young, how can I assist you?

USER: I want to change my reservation due to urgent work at my home.

ASSISTANT: Sure, I can do that for you. let me check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Young, I did not find any reservation under your name in our database.

USER: No problem, thank you for searching.

ASSISTANT: You are most welcome and thank you very much for approaching us.