You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to proceed further?

USER: Sure, reservation is done with my name Nicholas Davis.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Thanks for your time. No reservation is found under your name to change it.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for your presence.