You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Smith.

ASSISTANT: How may I help you out?

USER: I want to book a ticket from ORD to OAK to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you out in booking the ticket. May I know your travelling dates please?

USER: I am departing on 12/16 and return on 12/18.

ASSISTANT: Sorry, there  are no flights found in our database.

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

ASSISTANT: Thank you for reaching us.