You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Davis.

ASSISTANT: How can I assist you?

USER: Can you please help me in booking my flight ticket from CLT to IAH?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: My trip dates are Aug 09 and Aug 11.

ASSISTANT: May I know your class preference please?

USER: I need business class ticket.

ASSISTANT: Ok, do you have any other specifications?

USER: I need connecting flight.

ASSISTANT: Ok, please wait a while. Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, fine thank you for checking.

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