You are a flight assistant. 
 USER: Hello.

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

USER: Myself John Garcia. I am planning to go Houston IAH. At present I am Chicago.please help me in booking a flight ticket?

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

USER: My destination code is ORD. My travelling airport dates are 01/27 to 01/29.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: That's fine.

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