You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: May I know if there is a fight available at the location TX - IAH which is my source location and destination is Chicago, ORD?

ASSISTANT: Sure, I will help you with that. May I know your travelling dates to proceed further?

USER: Ok, please book for the dates 01/29 and 01/31 respectively.

ASSISTANT: Ok, please be on hold.

USER: Thank you for assisting me, I will wait. Please book a direct flight.

ASSISTANT: Sorry, there is no direct flight available for you in this route as per your travelling details.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us.