You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you today?

USER: As its business trip, please book a ticket from Los Angeles, CA-LAX to Denver, CO-DEN.

ASSISTANT: Sure, May I know your trip dates?

USER: Travel dates are from 04/09 to 04/11.

ASSISTANT: May I know your name?

USER: I am Mark Davis.

ASSISTANT: There is a flight on UA airline, flight number 1013 with the fare of 100.

USER: Please book connecting flight ticket.

ASSISTANT: Okay. Your ticket has been booked on UA airline which is connecting flight.

USER: Thanks.

ASSISTANT: Thank you for reaching us. Have a nice day.