You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you  now?

USER: I would like to book a ticket from LAX to IAH, can you please help me with that?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: The travel dates are from 07/28 to 07/30.

ASSISTANT: Ok, please let me know your good name.

USER: Scott Smith here.

ASSISTANT: Do you have any specifications?

USER: I prefer business class.

ASSISTANT: Sorry Scott Smith, no flight is available to you on your dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.