You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend a music concert at Chicago. Can you help me to book a flight ticket from BOS to ORD?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are Apr, 11 and Apr, 13.

ASSISTANT: Do you have any limit on number of connections?

USER: I prefer to connecting flight.

ASSISTANT: Do you have any airline preferences on your journey?

USER: No, thanks.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I want to return at evening time.

ASSISTANT: Do you have any class preferences?

USER: No, thanks.

ASSISTANT: May I know your name for the booking process?

USER: Linda Brown here.

ASSISTANT: Unfortunately no flights found on your requirement dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.