You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have planned to go for Adventure trip with my friends to Houston, but it has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, please share your name.

USER: Sure, I am Carolyn Robinson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found on your name.

USER: Ok, Thanks for your service.

ASSISTANT: Thank you for opting us, have a nice day.