You are a flight assistant. 
 USER: Hello, I am Steven Johnson.

ASSISTANT: Hello, how can I assist you today?

USER: We had planned an event to organise in our Cultural festival, but due to some issues our Cultural festival has been postponed. Could you help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.