You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from MSP to DEN?

ASSISTANT: Sure, may I know your period of travel?

USER: I would like to depart on June 29th and return on July 1st.

ASSISTANT: Do you have any time preference?

USER: No.

ASSISTANT: Which class do you prefer?

USER: I need a flight in economy class.

ASSISTANT: Do you have any other preference for your journey?

USER: I have no other preferences.

ASSISTANT: We have a flight from American airlines, number 1020 abd it is costing 200. Shall I confirm it?

USER: Yes, please confirm the booking.

ASSISTANT: May I know your name to book the flight?

USER: I am Catherine Carter.

ASSISTANT: Your ticket has been confirmed.

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

ASSISTANT: Thank you for opting us.