You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Angela Harris here.

ASSISTANT: Harris, how can I assist you?

USER:  I am having sudden meeting in my office, can you please help me changing my reservation?

ASSISTANT: Sure, I will help you in changing your reservation. Let me check your reservation status first.

USER: Sure, take your own time.

ASSISTANT: Harris, I did not find any reservation by your name in our database.

USER: That's fine, thank you so much.

ASSISTANT: You are welcome and thank you for choosing us.