You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy hall.

ASSISTANT: How may I aid you?

USER: I am planning to book a ticket from OAK to LAS to attend seminar, can you help me in booking?

ASSISTANT: May I know your journey dates?

USER: I am departing on 01/17 and return on 01/19.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flights available on this route.

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

ASSISTANT: Most welcome.