You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name for change in the reservation?

USER: Sure, I am Sharon Wright.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there are no active reservations on your name to change.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching our service.