You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to book a flight ticket from DFW to HOU, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you provide your travel dates please?

USER: Sure, my trip dates are Dec 25 and Dec 27.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific timings for your depart and return on?

USER: My depart time is evening.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Katherine Carter.

ASSISTANT: Sorry, there is no flight on your required dates.

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

ASSISTANT: Thank you for supporting us.