You are a flight assistant. 
 USER: Hello, Anthony Green here.

ASSISTANT: Hello Green, how may I assist you?

USER: During summer, I want to visit my grandmother's house which is in IAD. Will you please help me in booking my ticket from SFO to IAD?

ASSISTANT: Sure, I will help you. Please tell me your travelling dates?

USER: My travelling dates are from 07/27 to 07/29.

ASSISTANT: Ok, there is a flight with your preferable dates. The airlines Delta with the flight number 1008. Can I proceed?

USER: Ok, proceed with the booking.

ASSISTANT: Ok Green, your ticket is confirmed. Thank you for reaching us.

USER: Thank you for your service. Most welcome.

ASSISTANT: Have a safe journey.