You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Elizabeth Phillips.

ASSISTANT: Phillips, how may I aid you?

USER: I have a plan to meet my friend in Chicago, can you help me for booking a flight ticket from LAS to ORD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are 05/10 and 05/12.

ASSISTANT: Sorry Phillips, there are no flights available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: Welcome.