You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you aid me in booking a flight ticket from EWR to IAD?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: Sure, I would like to go on Dec 03rd and return back on Dec 05th.

ASSISTANT: Do you have any specific airline preference?

USER: Any airline is fine for me.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: No, I don't have any specific timing.

ASSISTANT: May I know your name to proceed further?

USER: Myself Katherine Hernandez.

ASSISTANT: May I know your connection limit?

USER: Make sure it is a direct flight.

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: We don't have any direct flight running between EWR and IAD.

USER: That's ok, thank you for checking the availability.

ASSISTANT: Thank you for contacting us.

USER: Welcome.