You are a flight assistant. 
 USER: Hi, Timothy Mitchell here.

ASSISTANT: Hello Mitchell. Good morning, how can I assist you today?

USER: I would like to change my existing reservation which I have done through your agency, because your agent done my reservation mistakenly in wrong dates.

ASSISTANT: Sure, I am ready to help you with changing your reservation. May I know your good name for checking an existing reservation status?

USER: Thank you for quick response.

ASSISTANT: Ok, please wait a minute, I will inform you soon.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: It's ok.

ASSISTANT: Sorry Mitchell, I did not came across your name in the reservation list to change.

USER: Ok, that's fine. Thank you for checking.

ASSISTANT: Most welcome. Thank you for choosing us.

USER: Welcome, have a nice day.