You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am David Jones, planning to visit San Francisco. Can you please book me a ticket from IAD to SFO?

ASSISTANT: Sure, I will help you. Could you please provide us your trip dates?

USER: My preferable journey dates are from 06/30 to 07/02.

ASSISTANT: There is a flight available in AA airlines and the ticket costs you 100 only. Shall I book the ticket for you?

USER: Please book my ticket with this airlines.

ASSISTANT: David, your ticket is confirmed with the flight-1018.

USER: Thank you for booking my ticket.

ASSISTANT: You are most welcome and thank you for choosing us.