You are a flight assistant. 
 USER: Hi, I am Kathleen Evans.

ASSISTANT: Hello, how can I assist you today?

USER: Please book a flight ticket on dates 11/27 and 11/29.

ASSISTANT: Sure, Do you prefer any halt in between your journey?

USER: Yes, I need.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I have already mentioned above.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: Yes, my airport codes are DC-DCA and CA-SFO.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Thanks for your precious time. We found Delta airline fare of 200. Shall I proceed for booking with single stopover flight?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed with airline number 1011.

USER: Thank you.

ASSISTANT: Thank you for choosing us.