You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Roberts.

ASSISTANT: In which way I can aid you at this moment?

USER: I want to travel from JFK to IAH. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: I want to fly in the flight on 03/12 and 03/14.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

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

ASSISTANT: Thank you for reaching us.