You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a flight ticket from DCA to DEN.

ASSISTANT: Your travelling dates please?

USER: My trip dates are from Sept, 13 to Sept, 15.

ASSISTANT: Do you have any specifications?

USER: I need a business class and I prefer a single connecting flight.

ASSISTANT: There is a flight with single connection in Hawaiian airlines, can I proceed for booking in business class?

USER: Please proceed.

ASSISTANT: On which name can I proceed for booking?

USER: I am Benjamin Anderson.

ASSISTANT: Your booking is done in 1026 flight.

USER: Thank you.

ASSISTANT: Thank you for choosing us.