You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am looking to book a flight ticket from DEN to DFW. Can you help me for that?

ASSISTANT: Sure, I will aid you. Please send your travelling dates.

USER: My travelling dates are Oct 18 and Oct 20.

ASSISTANT: Do you have any preferences?

USER: I need a single connecting flight.

ASSISTANT: May I know your name?

USER: My name is Shirley Lopez.

ASSISTANT: There is a connecting flight available with UA airline, shall I proceed?

USER: Ok, proceed for booking.

ASSISTANT: Your booking is done with flight number 1018. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.