You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: I am Benjamin Collins.

ASSISTANT: Ok, how can I serve you today?

USER: I want to change my existing reservation as my photography meeting has been postponed. Please help me out.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute I will check the status of your recent reservation and get back to you.

USER: Ok, take your time.

ASSISTANT: Thank you for your time. We have gone through our record list but we didn't find any reservation on the name of Benjamin Collins.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for choosing us, have a nice day.