You are a flight assistant. 
 USER: Hello. I am Carolyn Martin.

ASSISTANT: Hello, how can I assist you?

USER: I need to celebrate festival with my family at Philadelphia, PA - PHL. Can you book a flight ticket from Washington, DC - IAD?

ASSISTANT: Sure, when are you planning to travel?

USER: 01/14 and 01/16 are my travelling dates.

ASSISTANT: Please provide your specifications.

USER: I need a halt. 200 is my budget.

ASSISTANT: Delta airlines with single connection and price is 100 of 1023 flight. Shall I proceed for booking?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you.