You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to attend a Seminar in SEA. Can you please help me for booking the flight ticket from BOS?

ASSISTANT: Sure, can I have your travel  dates please?

USER: My travelling dates are Dec 26 and Dec 28.

ASSISTANT: Ok,  please let me know your preferable connections.

USER: I prefer single connecting flight.

ASSISTANT: Do you prefer any specific timings?

USER: I want to return in evening.

ASSISTANT: Are you  looking for any class?

USER: I prefer economy class.

ASSISTANT: Do you  prefer any specific airlines to travel?

USER: I prefer normal cost airline.

ASSISTANT: Can I have your good name please?

USER: Edward Rodriguez.

ASSISTANT: Sorry to inform you that  no flight is available to you on your dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.