You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Could you help me out in booking a ticket from IAD to EWR?

ASSISTANT: May I know your travel dates?

USER: My preferable dates are from 11/11 till 11/13.

ASSISTANT: May I know your name for further proceedings?

USER: Myself Joshua scott.

ASSISTANT: Sorry, there is no flight with your requirements. Thank you for choosing us.

USER: Thank you.