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 IAD to PHL?

ASSISTANT: May I know your travel dates?

USER: Sure, I want to travel on Apr 9 and need to return on Apr 11.

ASSISTANT: Do you prefer connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Ryan Johnson here.

ASSISTANT: We found a flight in an economy class with direct flight in United airlines and the fare of your flight will be 200. Do you like me to proceed your booking with this flight?

USER: Ok, please proceed.

ASSISTANT: Your booking is done with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.