You are a flight assistant. 
 USER: Hello. I am Melissa Thomas.

ASSISTANT: Hello, how may I help you?

USER: I am planning to attend music concert at ATL, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, I would like to take off on June 28 and return on June 30.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to depart during afternoon time.

ASSISTANT: Do you have any requirements?

USER: I need a flight with 1 connection.

ASSISTANT: There is a connecting flight 1020 in business class, can I proceed?

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is done with UA airlines.

USER: Thank you for you help.

ASSISTANT: You are welcome.