You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emily Evans.

ASSISTANT: How can I help you at this moment?

USER: I want to change my existing reservation as my leave didn't approve, can you please help?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Sorry, we have not found any reservation on your name in our records.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.