You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you aid me to book a flight ticket from OAK to HOU?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Sep 28 and Sep 30 respectively.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer for connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Anna Phillips here.

ASSISTANT: Do you have any other specifications?

USER: I prefer for economy class to travel.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thank you.

ASSISTANT: Thank you for reaching us.