You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Brian Hall. I want to book a ticket from DFW to JFK to meet my uncle, can you help me in booking?

ASSISTANT: Sure, help me with your trip dates.

USER: I am departing on 01/15 and return on 01/17.

ASSISTANT: Sorry, there is no flight on your requested dates.

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

ASSISTANT: Thank you for opting us.