You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I would like to visit Water World with my friend at Denver, please help me in booking a ticket from LAX to DEN.

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to start my journey on 07/18 and return on 07/20.

ASSISTANT: Please wait for a moment, mean while may I know your name?

USER: My name is James Garcia.

ASSISTANT: There is a direct flight 1015 with 100 price from UA airlines, shall I proceed?

USER: Please check the flight with single connection.

ASSISTANT: Sorry, no flight with single connection.

USER: Ok, please book my ticket with direct flight.

ASSISTANT: Ok, your booking is done with UA airlines.

USER: Thank you for your help.

ASSISTANT: Welcome.