You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in booking my flight ticket from IAH to OAK?

ASSISTANT: May I know your travelling dates?

USER: Sure, my trip dates are from 11/28 to 11/30.

ASSISTANT: Can I know your connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: Myself Karen Mitchell.

ASSISTANT: Sorry, no flights available on your route.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.