You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Jonathan Allen here. I want to book a flight from IAD to LAX, can you please help me in booking a flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my journey dates are from 02/20 to 02/22.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: There is a flight 1019 from Southwest airlines, shall I proceed?

USER: Ok, please proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your service.

ASSISTANT: Welcome.