You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I best serve you today?

USER: Could you please book a flight ticket from IAD to ORD?

ASSISTANT: Sure, can you please mention your depart and arrival dates of your journey?

USER: My trip dates are Oct 10 and Oct 12.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I need a connecting flight.

ASSISTANT: Can I know your good name to proceed further?

USER: I am Sarah Nelson.

ASSISTANT:  There is a flight in United airlines with the ticket price of 200 having one connection and economy class. Can I proceed to booking?

USER: Ok, proceed.

ASSISTANT: Your booking is confirmed and the flight number is 1007.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.