You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am willing to book a flight ticket from OAK - DCA. Can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Can I know your desired travel dates please?

USER: Sure, my travel dates are 01/13 and 01/15.

ASSISTANT: May I know your name please?

USER: Yes, I am John Phillips.

ASSISTANT: There is no flight available on your desired travel dates.

USER: Not an issue, I will go with another resources to reach out my destination. Anyway thank you for the help.

ASSISTANT: Thank you for reaching us.