You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Carolyn Thomas here. I need to attend a business meeting.Can you book a ticket from LAS to PHL?

ASSISTANT: Ok, when you want to travel?

USER: My travel dates are 09/15 and 09/17.

ASSISTANT: There is no flight for you on your route to book a ticket for you.

USER: It's ok, thank you.

ASSISTANT: Welcome, have a good day.