You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Sharon Wilson here. I got an invitation to attend seafood festival at Seattle, can you please help me in booking the ticket from IAH to SEA?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: Sure, I want to depart from here on 04/17 and fly-back on 04/19.

ASSISTANT: Just hold on a moment, I will check flight availability in this route. Sorry for the inconvenience no flights available in this route as per your requested dates.

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

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