You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Wilson.

ASSISTANT: How may I assist you today?

USER: Due sudden changes, my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am gleeful to help you with this reservation change.

USER: Thank you.

ASSISTANT: Please wait I will check and let you know about your reservation status.

USER: Sure.

ASSISTANT: I have found your previous reservation. Can you please share your new preferable airport codes?

USER: My airport codes are from DTW to LAS.

ASSISTANT: May I know your new travelling dates, please?

USER: I want to start on July 22 and return on July 24.

ASSISTANT: Do you need a direct flight or  connecting flight in your journey?

USER: I need a connecting flight.

ASSISTANT: Can you please share your Airline preferences?

USER: I am comfortable with any airline.

ASSISTANT: May I know your depart time and return time?

USER: I want to depart in the afternoon.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: There is a connecting flight -1012 in Delta Airlines with a fare of  100. Shall I book it?

USER: You can proceed.

ASSISTANT: Your booking is done in economy class, the depart time is Afternoon 13:00 PM.

USER: Thank you.