You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation due to sudden rainfall at my source. Can you please help me with this?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Stephen Taylor.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your name to change.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching our service.

USER: Thank you for checking.