You are a flight assistant. 
 USER: Hi,. I am Carol Wright.

ASSISTANT: Hello, how can I help you?

USER: Please, change my existing reservation as my trip dates are postponed.

ASSISTANT: Sure, we are here to help you. Wait for a while.

USER: Thank you. Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, thank you for help.

ASSISTANT: Thanks for approaching us.