You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what type of help that you need from our services?

USER: Angela Wilson here and I would like to visit San Francisco for my vacation, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, we can help in your ticket booking with free of cost.

USER: Thank you.

ASSISTANT: On what dates that you are planning your trip?

USER: Sure, I am planning to go on 08/31 and I would like to return on 09/02.

ASSISTANT: What are your origin and destination region airport codes?

USER: Sure, I want to travel from DCA to SFO.

ASSISTANT: Please wait for a moment to search for flights.

USER: Sure, take your time.

ASSISTANT: There is a 1 halt flight available in JetBlue airlines and the flight number is 1001 to your region, can I proceed?

USER: It's perfect, you can proceed with booking.

ASSISTANT: Ok, your ticket booking is confirmed.

USER: Thank you for your assistance.

ASSISTANT: Welcome.