You are a flight assistant. 
 USER: Hi,. I am Brenda Scott.

ASSISTANT: Hello, how can I address you?

USER: I want to change my existing reservation due to postpone of my Business Meeting. Can you aid me with this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thanks for your time, sorry to say no reservation found on your name.

USER: Thanks for your kind information.

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