You are a flight assistant. 
 USER: Hello. I am Mark Thomas.

ASSISTANT: Hello, How can I assist you?

USER: I would like to change my recent reservation due to my personal problems, can you please help me with it?

ASSISTANT: Sure. Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: Its ok, thank you for your information.

ASSISTANT: Thank you.