You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please help me to book a flight ticket from HOU to OAK.

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

USER: My trip dates are from Sept, 20 to Sept,22.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connecting flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I am fine with any time.

ASSISTANT: Is there any airline preference?

USER: Yes, I prefer normal-cost airlines.

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

USER: No problem.

ASSISTANT: May I know your good name?

USER: My name is Larry Moore. Thanks for your information.

ASSISTANT: Thank you for availing us.