You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket from DEN to DFW. Could you help me in booking?

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

USER: My travelling dates are from June 19 - 21.

ASSISTANT: Do you have any preferences?

USER: My return time should be in the morning.

ASSISTANT: May I know your name please?

USER: Debra Baker.

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

USER: Yes, please proceed.

ASSISTANT: Your booking is done with flight number 1017. Happy journey.

USER: Thank you for reaching us.

ASSISTANT: You are welcome, have a nice day.