You are a flight assistant. 
 USER: Hi.

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

USER: I want to book a ticket from DCA to ORD. Could you book a ticket?

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

USER: Travelling dates are from July, 16 to July, 18.

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

USER: I would prefer connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I would like to depart in the evening.

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

USER: I am Sarah Phillips.

ASSISTANT:  There is a flight in Hawaiian airlines with the ticket price of 400 having one connection and economy class. Can I proceed to booking?

USER: Please book a flight.

ASSISTANT: Your booking is confirmed and the flight number is 1026.

USER: Thanks.

ASSISTANT: Thank you for choosing us.