You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jacob King from Philadelphia. I want to book a flight ticket from PHL to LAS?

ASSISTANT: May I know your travelling dates please?

USER: Ok, my planned trip dates are on 12/23 and return on 12/25.

ASSISTANT: I am sorry no flight found on your route.

USER: Ok, not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.