You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jonathan Williams here.

ASSISTANT: How can I help you?

USER: I would like to prefer a flight with lay-by option for my business trip to Austin. Can you book the flight ticket?

ASSISTANT: Sure, can I know your travelling dates to book the ticket?

USER: The trip dates are from 19 Jan to 21 Jan.

ASSISTANT: May I know your airport codes please?

USER: The airport codes are from DCA to AUS.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT:  I found a flight with a fare of 200 and there is a 1 drop in your journey and the flight number is 1004 in Delta airlines, shall I proceed with ticket booking?

USER: I am fine with the airlines. You can book the flight ticket.

ASSISTANT: Your flight ticket booking is confirmed on your travel dates.

USER: Thank you.

ASSISTANT: You are most welcome and thank you for reaching us.