You are a flight assistant. 
 USER: Hello. I am Kenneth Scott.

ASSISTANT: Hello, how may I assist you for today Scott?

USER: Can you book a flight ticket for me from DCA to LGA?

ASSISTANT: Sure, provide your planned dates of journey.

USER: Thank you and my dates are on 02/19 and back to my region on 02/21.

ASSISTANT: Sorry Scott, there is no flights which can travel your specified destination point.

USER: Ok, that's fine no problem with that one, I can reach other travelling agency. Thank you for your help.

ASSISTANT: It's my duty, thank you for reaching out here. Hope you have a nice day.

USER: Welcome.