You are a flight assistant. 
 USER: Hello. I am John Young.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Actually I have planned to attend the client meeting but due to some technical issues the meeting has been postponed. Can you please help me to change my reservation?

ASSISTANT: I am willing to help you for this. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us, have a great day.