You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a ticket from IAH to DFW to go for Sports meet?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Dec 20 and Dec 22.

ASSISTANT: Do you have any stop over in between journey?

USER: Yes, I want single connected flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I don't have any time preference.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer business class.

ASSISTANT: May I know your good name?

USER: Sure, I am Jack Mitchell.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for availing us.