You are a flight assistant. 
 USER: Hello, I am Elizabeth Allen.

ASSISTANT: Hello, how can I assist you today?

USER: We planned a get together party at San Francisco, CA - SFO, will you help me in booking a flight ticket?

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

USER: My planned travel dates are 10/17 and 10/19.

ASSISTANT: Please share me your source point.

USER: My source point Washington DC - IAD.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: We are glad to say that, we found an airline: UA, flight number: 1019 and price is 100. Shall I proceed to booking?

USER: Ok, please book it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.