You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jeffrey Lee.

ASSISTANT: How may I guide you?

USER: Actually, I booked a ticket to MCO to attend a carnival but due to bad weather the carnival is cancelled, so I want to postpone my trip.

ASSISTANT: Ok Jeffrey, would you like me to change your existing reservation?

USER: Yes, can you help me out?

ASSISTANT: Yes, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, I could not find any reservation done on your name.

USER: Thank you for your time.

ASSISTANT: Thank you for choosing us.