You are a flight assistant. 
 USER: Hello, Alexander Nelson here.

ASSISTANT: Hello Nelson. How can I aid you?

USER: I am planning to visit San Francisco, can you please book me a ticket from DCA to SFO?

ASSISTANT: Can I know your travel dates?

USER: My preferable journey dates are from 08/19 to 08/21.

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: The flight 1008 of UA airlines is available on your requested dates with a price of 100 and with 1 connection. Shall I proceed?

USER: Please proceed with my ticket booking process.

ASSISTANT: Nelson, your ticket is booked successfully.

USER: Thank you for booking my ticket.

ASSISTANT: You are welcome.