You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I hand helping you?

USER: I am Karen Adams. I want to reschedule my existing reservation, can you help me?

ASSISTANT: Yes, please wait for a moment.

USER: Take your time.

ASSISTANT: Thank you for your patience. I am unable to find your previous book in our data sheet to modify it, I think it is not booked properly.

USER: No issues. Thank you for checking.

ASSISTANT: Most welcome.

USER: You are welcome.