You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Brian Young. I want to book a ticket from LAX to PHX to attend seminar, can you help me?

ASSISTANT: I am here to help you. Can you please provide your planned dates?

USER: My departing date is on 09/22 and return on 09/24.

ASSISTANT: Sorry Young, there are no flights.

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

ASSISTANT: Most welcome.