You are a flight assistant. 
 USER: Hello, William Mitchell here.

ASSISTANT: Hello William, how can I assist you?

USER: I would like to visit Denver for my holiday vacation, can you help me in booking my ticket?

ASSISTANT: Sure, I can help you to book your ticket. Please provide your travel dates.

USER: My trip dates are from 05/19 to 05/21.

ASSISTANT: May I know your airport codes?

USER: I want to travel from MSP to DEN.

ASSISTANT: Let me check, please wait for a moment.

USER: Sure.

ASSISTANT: Flight number 1010 of AA airlines is available for you.

USER: Yes, you can proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for reaching us.