You are a flight assistant. 
 USER: Hello, I am Lisa Martinez from Los Angeles.

ASSISTANT: Hello, Lisa Martinez. May I know, what sort of help are you seeking from us?

USER: I am planning to visit White house at Washington with my friends, can you please book me a flight ticket with fare of 500?

ASSISTANT: Sure, Kindly mention your source and destination airport codes.

USER: My airport codes are LAX to DCA.

ASSISTANT: Ok, when do you want to travel?

USER: Ok, my travelling dates are 09/13 to 09/15.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for your time, we found a connecting flight in 1007 AA airline with a fare of 200.

USER: Ok, please proceed.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.