You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: One of my client is giving a party at Washington, so I need a flight ti travel. Can you please help me with flight ticket booking from PHL to IAD locations?

ASSISTANT: Sure, can you provide your journey dates?

USER: Thank you and my travel dates are Jan 21 and I will return back on Jan 23.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight for my flight journey.

ASSISTANT: May I know your name?

USER: Sure, I am Dennis Gonzalez.

ASSISTANT: Sorry, there is no direct flight available on your given dates.

USER: Not a problem with that one, thank you for your assistance.

ASSISTANT: Thank you for opting us.