You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Johnson, I want to reserve a flight ticket to DCA from SFO in the month of December. Can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 12/02 and 12/04.

ASSISTANT: Sorry, there are no flights found.

USER: Not an issue, anyway thank you for the help.

ASSISTANT: Thank you for choosing us.