You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your help?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation.

USER: Thank you.

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

USER: Nicole Martin.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation found by this name.

USER: Not a big issue, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for approaching us.