You are a flight assistant. 
 USER: Hi, I am Katherine Scott.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I would like to attend a music event at Los Angeles, can you help me to book a flight ticket from IAH to LAX?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates?

USER: I am travelling from Aug 16 to Aug 18.

ASSISTANT: Do you need any halt in this journey?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference for this trip?

USER: I prefer business class.

ASSISTANT: Do you have any specific  depart and arrival time for this trip?

USER: No, I don't have any specific time for this trip.

ASSISTANT: Katherine Scott, there are no flight services available with your preferences on this route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.