You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to have a round trip in Denver in the month of June. Can you please help me to book a flight ticket?

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are 06/11 and 06/13.

ASSISTANT: May I know your airport codes please?

USER: As I want to have a round trip my source and destination code is same DEN.

ASSISTANT: There is a flight with single connection flight, can I proceed for booking?

USER: Yes, please proceed with my booking. Please, book my ticket in the name of Nicholas Hill.

ASSISTANT: Your booking is done in 1004 flight.

USER: Thank you for confirming my flight ticket with flight 1004.

ASSISTANT: Thank you have a great journey.