You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have to attend a Live Concert at Atlanta, could you please help me with booking a flight ticket from IAH to ATL?

ASSISTANT: Sure, please share your journey dates?

USER: I would like to depart on Dec 19th and return on Dec 21st.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Is there any class preferences?

USER: I am comfortable with any class.

ASSISTANT: We found a direct flight in Hawaiian airlines, flight number is 1028 with price is 200. Shall I proceed?

USER: Yes, please confirm the booking.

ASSISTANT: May I know your good name?

USER: I am Catherine Lewis.

ASSISTANT: Your ticket has been booked.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for choosing us.