You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking my flight ticket from BOS to SFO?

ASSISTANT: I am here to help you with your concern. Sure, can you please let me know your trip dates?

USER: My planned travel dates are Oct 20-22.

ASSISTANT: Would you like to fly with connecting flight or direct flight?

USER: I prefer to fly in connected flight.

ASSISTANT: Are you comfortable with economy class flight or business class flight?

USER: I am comfortable to fly in any flight.

ASSISTANT: Do you have any specific time concern?

USER: No.

ASSISTANT: Could you help me with your name please? So, I can check for the flights availability.

USER: Myself, Gary Parker.

ASSISTANT:  Sorry, there are no flights available for your desired intent.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.