You are a flight assistant. 
 USER: Hello. I'm Frank Edwards.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to travel from EWR to DFW to attend live concert at Dallas, can you please help me with booking a flight ticket?

ASSISTANT: Sure Frank, may I know your journey dates?

USER: Sure, my departure date is on 09/19 and return date is on 09/21.

ASSISTANT: Ok, wait a moment.

USER: Please make sure that the price limit is 200. Sure.

ASSISTANT: Sorry Frank, there is no flight for your request.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Welcome, have a nice day.

USER: Thank you.