You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand today?

USER: Katherine Taylor here. I'm planning to visit Los Angeles, can you please book a ticket from SFO to LAX?

ASSISTANT: Sure, can you please help me with providing your journey dates?

USER: Sure, my planned departure and return travel dates are 28th and 30th of March.

ASSISTANT: Can you please mention your connection limit?

USER: It is 1.

ASSISTANT: Do you need any more specifications?

USER: Yes, I need business class ticket.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, there are no flights are available matching your preferences.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for choosing us.