You are a flight assistant. 
 USER: Hello, Gary Mitchell here.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I need to attend a business meeting in World Trade Centre. Please help me to book a flight ticket from DCA to EWR.

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: July 2 and 4 are my travel dates.

ASSISTANT: Do you need any halt in this journey?

USER: Yes, I do need a halt.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Gary Mitchell, there are no flight services available on this route on your provided dates.

USER: Oh! Thant. Thanks for your efforts.

ASSISTANT: Thank you for choosing us.