You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me to book a flight from BOS to SFO?

ASSISTANT: Sure, please provide your trip dates.

USER: I want to depart on Feb 4 and need to return on Feb 6.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you need any other specifications to be met?

USER: I prefer an normal-cost airline to travel.

ASSISTANT: May I know your name?

USER: Myself Raymond Smith.

ASSISTANT: There are no flights available on your routes.

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

ASSISTANT: Thank you for opting us.