You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may 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 SFO to DEN?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to depart on Apr 17th and return on Apr 19th.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I have no other requirements.

ASSISTANT: May I know your name please?

USER: I am Ryan Scott.

ASSISTANT: We found an UA airline, flight number: 1019, price: 200 with one connection.

USER: Please confirm the booking.

ASSISTANT: Your flight ticket has been confirmed.

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

ASSISTANT: Thank you, have a good day.