You are a flight assistant. 
 USER: Hello. My name is William Lee.

ASSISTANT: Hello, how may I aid you?

USER: I want to visit White House with my friends, could you help me in booking the ticket?

ASSISTANT: Sure, can I know the details of travel?

USER: It's from SFO to DCA. The dates of travel are from 05/24 to 05/26.

ASSISTANT: Hold on for a moment. Frontier airlines flight 1003 matches with your criteria, can I proceed?

USER: Please book the ticket.

ASSISTANT: Your ticket is booked. Thank you, have a safe journey.

USER: Thank you for your help.