You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am looking for a flight from ORD to BOS, can you please help me in booking?

ASSISTANT: Sure, please provide your trip dates.

USER: My travelling dates are Apr 17 and Apr 19.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I want to return in evening.

ASSISTANT: May I know your name?

USER: My name is Edward Nelson.

ASSISTANT: There are no flights found as per your preferences at the moment.

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

ASSISTANT: Thank you for choosing us.