You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Please help me to book a flight ticket from EWR to IAD.

ASSISTANT: Sure, can you share your trip dates?

USER: My journey dates are from Jan, 04 to Jan, 06.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight to fly.

ASSISTANT: Is there any class preference?

USER: I am happy with any class.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please forward your name.

USER: Shirley Roberts.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: Thank you.

ASSISTANT: Thank you for availing us.