You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Thomas.

ASSISTANT: How can I assist you at this moment?

USER: I need to attend a business meeting at Chicago. So, please help me in booking a flight ticket from IAD.

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

USER: Thank you, my travelling dates are Jan 23 and Jan 25.

ASSISTANT: Can you please provide me airport code of your destination location?

USER: My destination airport code is ORD.

ASSISTANT: Ok Nicholas Thomas, 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. Is it ok for you?

USER: Yes, you can proceed with booking.

ASSISTANT: Ok Nicholas Thomas, your ticket booking has done and the flight number is 1005.

USER: Thank you.

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