You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I am Shirley Williams want to go for a vacation due some issues it was postponed, so can you please change my existing reservation?

ASSISTANT: Sure, we are glad to help you. To proceed further can I know your good name please? Sorry for the inconvenience, Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us, Have a wonderful day.