You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Mary Taylor, I just want to change my existing reservation due to my press conference has been postponed. Can you help me to change it?

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for choosing us.

USER: That's ok, thanks for your information.