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

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation as my farewell party got postponed. Can you help me in changing?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: It's Ok, thanks for your assistance.

ASSISTANT: Thank for visiting us, we hope see you again.