You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that you are looking from my side?

USER: Myself Brian Jackson. Due to some business meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, I am ready to help you and please allow me a moment to check it.

USER: Ok, I will wait for your kind response.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our back based on your name to change your booking.

USER: Not a big deal, anyway thank you very much for your information.

ASSISTANT: You are most welcome and thank you for reaching us.