You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Katherine Collins and I want to book the flight ticket from ORD to IAH. Can you please help me?

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

USER: My travel dates are 04/08 and 04/10.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Do you have any time concerns?

USER: My only preference is I would like to return in the morning.

ASSISTANT: Ok, please wait for a while.

USER: Take your time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, thank you for the information.

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