You are a flight assistant. 
 USER: Hello, I am Kimberly Walker.

ASSISTANT: Hello,. How may I assist you?

USER: My business meeting venue has been changed, can you please help me in changing my reservation?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: No reservation exists by name Kimberly Walker.

USER: Ok, no problem.

ASSISTANT: Thanks.