You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Young here.

ASSISTANT: How can I help you today?

USER: I have planned a trip with my students to enjoy the holidays in water world in the month of March, so please book an advance flight ticket for me to IAH from my home town DCA?

ASSISTANT: Sure, I will help you in booking flight ticket. can you please mention your travel dates for booking flight ticket?

USER: Thank you. I am planning to leave my location on 03/22 and please book my return ticket on 03/25.

ASSISTANT: Just give me a moment, I will check is there any flight available or not in this route as per your requested dates.

USER: Sorry, just now my plan have changed to 03/24. Please book my return ticket on that date.

ASSISTANT: Sure, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Based on your information, Spirit airline is ready to serve you with 1 connection with a minimum fare of 200 is available for you. Shall I proceed with this?

USER: That's fine for me, you can proceed with booking.

ASSISTANT: I have confirmed your flight ticket, flight number is 1000.

USER: Thank you for your kind assistance in booking of my ticket.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.