You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my existing reservation due to postpone of my new house warming ceremony. Can you please help me?

ASSISTANT: Sure, I am here to help you with this. Can you please provide your name to check your reservation status?

USER: Sure, I am James Thompson,.

ASSISTANT: James Thompson, there is no active reservation found under your name in our database.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for contacting us.