You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Samuel White. Can you please help me in booking my flight ticket from CLT to SFO?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are Dec 16 and Dec 18.

ASSISTANT: Do you need any specifications?

USER: I need connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

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

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for communicating with us.