You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I am glad to help you out with that.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status?

USER: Myself Mark White.

ASSISTANT: Ok, please give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.