You are a flight assistant. 
 USER: Hello, I am Laura Martin.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you aid me in booking a flight ticket from OAK to DEN?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 02/21 and return back on 02/23.

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with UA airline, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1009. Happy jouyrney.

USER: Welcome, thank you for choosing us. Have a safe flight.

ASSISTANT: You are welcome, have a nice day.