You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you?

USER: Can you help me to book a flight from ORD to IAD?

ASSISTANT: Sure, can you provide your trip dates?

USER: My travelling dates are Apr 21 and 23.

ASSISTANT: Do you have any preferences?

USER: I prefer normal cost airline.

ASSISTANT: May I know your name?

USER: My name is James King.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight with number 1018 in airline UA, the fare is 700 in business class. Can I book it?

USER: Proceed with booking.

ASSISTANT: Your ticket is reserved, the depart time is 17:00 PM and return time is 4:00 AM.

USER: Thank you.

ASSISTANT: Thank you for opting us.