You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please book a flight ticket from IAH to OAK?

ASSISTANT: When you are willing to travel?

USER: My journey dates are Dec 06 and Dec 08.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May, I know your good name?

USER: I am Joseph Green.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.