You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am William Davis. I am heading to Washington DC - IAD to sell my property. Can you book me a ticket ?

ASSISTANT: OK sure, please provide your source airport code.

USER: Yes, my boarding point will be Los Angeles, CA - LAX. My travelling dates will be from Apr/10 to Apr/12.

ASSISTANT: Please wait for sometime, I will check the availability of the flights.

USER: Sure.

ASSISTANT: Thanks for waiting, I found a flight with your given details. The flight details are flight number: 1007, airline: Spirit, price: 100.

USER: OK. Please book my ticket.

ASSISTANT: OK sure, your flight ticket has been confirmed.

USER: Thanks for your service.