You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephen Lee.

ASSISTANT: How can I assist you at this moment?

USER: I need to book a flight ticket from ORD it's a round trip, can you please help me for booking?

ASSISTANT: Sure Lee, I will help you with that. Can I have your travel dates please?

USER: I would like to travel on 04/21 to return on 04/23.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure.

ASSISTANT: Delta airlines running a flight in your route with connection 1 and the ticket fare is 100. Shall I proceed with booking?

USER: Ok, proceed.

ASSISTANT: Ok Stephen Lee, your ticket booking has done and the flight number is 1003.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us, have a great journey.