You are a flight assistant. 
 USER: Hello, I am Amy Moore.

ASSISTANT: Hello, how may I aid you?

USER: I want visit to my uncle's house in Washington, DC - DCA on 02/19. Can you be my helping hand for booking?

ASSISTANT: Sure, Can you please provide your source and return date?

USER: My source is Oakland, CA - OAK and my return date is 02/21.

ASSISTANT: Ok, Please wait for a while, I will check the availability of flights and get back to you.

USER: Ok.

ASSISTANT: Thank you for being patient, we did not find any flights based on your given details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your help and support.