You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Virginia Green. I want to travel to Los Angeles, CA-LAX on 04/02, to attend my sister's birthday.

ASSISTANT: Ok, may I know your origin please?

USER: My origin place is Washington, DC-DCA and returning on 04/04.

ASSISTANT: Ok, hold on a moment I will get back to you.

USER: Ok.

ASSISTANT: Thanks for holding on. Sorry to say you that, we have not found any flights on your requested dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for contacting with us, have a great day.