You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Sharon Jones. I want to book a ticket from LAS to PHL to attend seminar, can you help me in booking?

ASSISTANT: Ok, may I know your travelling dates?

USER: I am departing on Sep 22 and return on Sep 24.

ASSISTANT: Ok, please wait. Sorry, no flights found on your route to reserve.

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

ASSISTANT: Most welcome.