You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking a flight ticket from EWR to BOS?

ASSISTANT: Sure, we are here to help you. Can you assign me your trip dates?

USER: Sure, my travel dates are from May 21 to May 23.

ASSISTANT: Do you need any way station in your journey?

USER: I need a direct flight.

ASSISTANT: Is there any class preference for you?

USER: I would like to return in the evening.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have any preferences.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: For documentation, may I know your name please?

USER: Carolyn King here.

ASSISTANT: Thank you for choosing us, have a good day.