You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Justine Martinez. I am planning to book a ticket from OAK to HOU. Can you please help me out?

ASSISTANT: Sure, May I know the journey dates?

USER: I am planning to travel on Oct 20 and return back on Oct 22.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: My depart time is evening and my return time is afternoon.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for opting us.