You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Do you need any help from my side?

USER: I would like to book a ticket from PHL to IAD, can you please help me out?

ASSISTANT: Sure, I can help you with flight ticket booking and may I know your preferable travel dates?

USER: I am travelling on these dates Dec 19th and 21st.

ASSISTANT: Can I know your name please?

USER: Pamela Walker here.

ASSISTANT: Can I know your airline preference?

USER: I don't have any airline preference.

ASSISTANT: Do you have any other specifications?

USER: I prefer return time in the evening and economy class.

ASSISTANT: Please wait for a moment.

USER: I need single connected flight.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok no problem, thank you for your kind services.

ASSISTANT: Thank you for reaching us, have a nice day.