You are a flight assistant. 
 USER: Hi. I am Sandra Lee.

ASSISTANT: Hello, how can I serve you today?

USER: I want to celebrate my sister marriage anniversary in Los Angeles, CA - LAX. Can you please help me with book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I have planned my travel dates are 04/22 to 04/24.

ASSISTANT: Please share me your source point.

USER: Sure, my source code is from Washington DC - DCA.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need halt in between the journey.

ASSISTANT: We are glad to say that, we found an airline: Southwest, flight number: 1015 and price is 200.

USER: OK, please proceed to book.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for the information.

ASSISTANT: Thank you for opting us.