You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

USER: As I need to attend scheduled meeting on 11/28 unfortunately, meeting got delayed a week. So, please help me in changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to trace your details?

USER: Sure, my name is Anna Thomas.

ASSISTANT: Ok Anna Thomas, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found based on your given name.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.