You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to book a ticket to attend an Innovation festival at Houston so, can you book a ticket from SFO?

ASSISTANT: Sure, let me know your trip dates?

USER: My trip dates are Sept 13 and Sept 15.

ASSISTANT: Ok, can I know your destination airport code?

USER: Houston airport code is IAH.

ASSISTANT: Ok, do you need any break in your journey?

USER: Yes, I need a break.

ASSISTANT: Do you have any other requirements to be met?

USER: I prefer a business class airline.

ASSISTANT: Can you share your name to proceed further?

USER: My name is Gary Jackson.

ASSISTANT: Sorry, no flights found as per requirements.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.