You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: In which way I can aid you at this moment?

USER: I am planning to book a ticket from IAD to OAK. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. May I know your preferable travel dates for booking flight ticket?

USER: I would like to travel on 01/19 and return back on 01/21.

ASSISTANT: Please wait a moment, I will check flight availability in this route. According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 is provided by Southwest airlines. Shall I proceed with this?

USER: Sure. Proceed the booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1000.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.