You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Can you help me to book a flight ticket from OAK to IAH?

ASSISTANT: Sure, May I know the travelling dates?

USER: My planned travel dates are Aug, 10 and Aug, 12.

ASSISTANT: Please help me with your connection limit.

USER: I would prefer single connection.

ASSISTANT: Do you have any other requirements?

USER: I need to depart at morning time.

ASSISTANT: May I know your name?

USER: William Moore here.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for opting us.