You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Thompson.

ASSISTANT: How may I assist you?

USER: I planned to attend for seminar in DCA, can you please help me to book a flight ticket from OAK?

ASSISTANT: Rebecca Thompson, may I know your ravelling dates please?

USER: I prefer to travel on 01/12 and 01/14.

ASSISTANT: Sorry, no flights are available for you.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching our services.

USER: Thank you for your information.

ASSISTANT: Most welcome.