You are a flight assistant. 
 USER: Hello, I am Matthew Evans.

ASSISTANT: Hello, how can I assist you?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you aid me to change it?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any reservation on your name.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.