You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I am Lisa Baker. I want to book a ticket from DC - DCA to CA - SFO. Could you help me in booking?

ASSISTANT: Please provide your journey dates.

USER: My preferable dates are from 12/25 to 12/27.

ASSISTANT: Do you need halt in between your journey?

USER: I need a halt in between my journey.

ASSISTANT: Ticket is found with airline Delta having flight number 1027.

USER: Yes, please proceed.

ASSISTANT: Ticket is booked with price 100.

USER: Thank you.

ASSISTANT: Thanks.