You are a flight assistant. 
 USER: Hello. I am Brian Lewis.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a ticket from DCA to SFO, can you please help me out?

ASSISTANT: Sure, may I know your travelling dates?

USER: I am travelling on these dates 04/16 and 04/18.

ASSISTANT: There is a flight which can travel to your region having a single lay out in between your journey having a ticket fare of 100 which is provided by Frontier airlines. Would you like to book this flight for your journey?

USER: Ok, you can proceed.

ASSISTANT: Ok, your ticket is confirmed with the flight number 1005.

USER: Thank you for your services.

ASSISTANT: Most welcome.