You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am planning to book a flight ticket to DCA from SEA, can you please help me out?

ASSISTANT: Sure, can you please forward your preferred journey dates?

USER: Sure, my planned travelling dates are Oct 06 and Oct 08.

ASSISTANT: Can  you please mention your connection limit?

USER: Sure, I am looking for a flight with 1 connection.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer business class.

ASSISTANT: Do you prefer any other specifications?

USER: Yes, my depart time must be in evening.

ASSISTANT: May I know your name please?

USER: Sure, my name is Nicole Baker.

ASSISTANT: Sorry to inform you that, we did not find any flights matching your requirements.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing our services.