You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: I am Laura Baker, I want to book round trip ticket from Seattle SEA. Please book my ticket.

ASSISTANT: Sure, may I know the travelling dates please?

USER: My travelling dates are from 10/13 to 10/15.

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

USER: It's ok.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you.