You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Justin Scott. I am planning to meet my friends in EWR, can you help me in booking the ticket for me?

ASSISTANT: Sure, can you please share your travel dates?

USER: My planning dates are from 01/13 to 01/15.

ASSISTANT: Could you please help me with the source airport code?

USER: My origin airport code is OAK.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Justin, there is no flight available at your requested dates.

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

ASSISTANT: Thank you for contacting us.