You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from PHL to IAD?

ASSISTANT: Can I have your journey dates?

USER: Sure, I want to travel on July 5 and need to return on July 7.

ASSISTANT: Do you need any connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no problem.

ASSISTANT: May I know your name?

USER: I am Dennis Wilson.

ASSISTANT: Thank you for choosing us.

USER: Thank you.