You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Michelle White. Please change my reservation as my meeting was changed.

ASSISTANT: Sure, please wait for a minute.

USER: Ok, I will wait.

ASSISTANT:  Sorry for the trouble which is caused to you, there is no reservation found with your name in our system data to change the reservation.

USER: Ok, no problem. Thank you.

ASSISTANT: My pleasure.