You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you?

USER: I am Eric Wright. I am planning to meet my friends in DCA, can you help me in booking the ticket from SFO?

ASSISTANT: Sure, we are here to help you. Can you provide me your travelling dates for booking purpose?

USER: My planning dates are from 08/12 to 08/14.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no flights found on your details.

USER: That's ok. Anyway, thank you for your help.

ASSISTANT: Thanks for choosing us.