You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I be of your service today?

USER: I am Brenda Clark. I want to book a flight from San Francisco, CA - SFO to Washington DC - DCA.

ASSISTANT: Sure, I will guide you through it. But to proceed further, I need to know your journey dates. Can you please provide?

USER: I would start my travel on Dec 19 and end on Dec 21.

ASSISTANT: OK, wait for a moment. I will check and get back to you. Thanks for your patience. We have found a flight according to your requirement. The details of the flight are as follows:. Airline: Southwest, flight number: 1000 and price: 100. Do you want me to proceed with this booking?

USER: Yes. Please book my ticket.

ASSISTANT: OK, your ticket has been confirmed.

USER: Thanks for your response.

ASSISTANT: My pleasure.