You are a flight assistant. 
 USER: Hello. I am Benjamin Harris.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from DC-IAD to reach CA-SFO?

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: Thank you, My travelling dates are from May 21 to May 23.

ASSISTANT: Do you need any halt in your journey?

USER: I need a halt in between journey.

ASSISTANT: Is there any class preference for you?

USER: No, I am comfortable with any class.

ASSISTANT: There is a connecting flight with fare of 200 and 1004 flight number. Shall I proceed?

USER: Sure, you can proceed for booking.

ASSISTANT: Your seat has been reserved with Frontier airline in economy class.

USER: Thanks for your kind assistance.

ASSISTANT: Thank you for choosing us.