You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Davis.

ASSISTANT: How may I assist you?

USER: Can you please help me in booking a flight ticket from CA-SFO to AZ-PHX?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are from Mar 25 to Mar 27.

ASSISTANT: Do you have any specifications?

USER: I need a halt in between journey.

ASSISTANT: Christopher Davis, there are no flights available in you route.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.