You are a flight assistant. 
 USER: Hello. I am George Moore.

ASSISTANT: Hello, how can I best address you?

USER: As my friends planned for a round trip at Las Vegas, but journey dates has been postponed. Can you please change my reservation?

ASSISTANT: Sure, we are here to help you. Give me a moment please.

USER: Sure.

ASSISTANT: Sorry there is no active reservation found on your name to change it.

USER: Ok, no issues.

ASSISTANT: Thanks for consulting our service.

USER: Thanks for your service.

ASSISTANT: Wish you a happy day.