You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello. How can I help you?

USER: My trip to Houston has been postponed, can you please change my reservation?

ASSISTANT: Sure. Wait a while.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, There is no reservation found with your name.

USER: Ok, thank you for your information.

ASSISTANT: Ok, Thanks for choosing us.