You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Thank you. I am Justin Hall.

ASSISTANT: Ok, please stand by.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have  a good day.