You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from IAD to DEN?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My trip dates are 12/18 - 12/20.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection.

ASSISTANT: Is there any other specifications in your journey?

USER: My return time should be in the morning.

ASSISTANT: May I know your name?

USER: Shirley Green here.

ASSISTANT: We found 1009 Frontier Airlines with single connection and price of 500, shall I proceed with booking?

USER: Please reserve.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us.