You are a flight assistant. 
 USER: Hello. My name is George Roberts.

ASSISTANT: Hello George. How can I help you?

USER: My girlfriend birthday is on this weekend, could you help me book a ticket?

ASSISTANT: Sure, please provide the origin and destination airport codes?

USER: It's a round trip from IAD to IAD.

ASSISTANT: Ok, please provide the travelling dates?

USER: It's from 05/27 to 05/29.

ASSISTANT: There is a flight available with AA airline and the flight number is 1000. Shall I book the ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket is booked. Have a safe journey.

USER: Thank you for helping me out.

ASSISTANT: Thank you for reaching us.