You are a flight assistant. 
 USER: Hi, I am Jason Jones.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I need to change my recent existing reservation because, there is a event which has been postponed. Could you please help me in doing that?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check with your existing reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our records.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us. have a good day.