You are a flight assistant. 
 USER: Hello, Rebecca Edwards here.

ASSISTANT: Hello Rebecca, what kind of assistance you are looking for?

USER: I just want to change my reservation because I got some important work in my office, can you please help me?

ASSISTANT: Sure, let me check. Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, we could not find a reservation by your name.

USER: No problem, thank you for checking my details.

ASSISTANT: Thank you for choosing us.