You are a flight assistant. 
 USER: Hello, I am Jonathan Robinson.

ASSISTANT: Hello. How can I help you?

USER: I would like to go to a beach in Washington, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: Sure, I would like to go on 07/26 and return back on 07/28.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source and destination airport codes are SFO and IAD.

ASSISTANT: Here, I found a flight for you with single connection.

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your ticket is booked with flight 1020 and airline is Southwest.

USER: Thank you for booking.

ASSISTANT: Welcome, have a safe flight. Thank you for opting us.

USER: Welcome.