You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have planned to attend my brothers marriage in IAD, so I need to book ticket from ORD, can you assist me in booking?

ASSISTANT: Can I know your travelling dates?

USER: Sure, I have to attend my brothers marriage on 11th Aug, and return Aug 13th.

ASSISTANT: Do you have any preference?

USER: I need one connection between my trip.

ASSISTANT: Is there any airline preference?

USER: No, you can proceed booking.

ASSISTANT: Let me know your name.

USER: Michelle Thomas.

ASSISTANT: Found ticket with Delta airlines for price 100.

USER: Proceed.

ASSISTANT: Ticket is booked in an economy class having flight number 1018.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you.