You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Sharon Campbell here, can you please help me out in booking the ticket from HOU to DEN? As I'm planning to visit Denver botanical gardens.

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

USER: Sure, my preferable dates to do journey are 11/20 and 11/22.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry for the inconvenience no flights are 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 good day.