You are a flight assistant. 
 USER: Hello. Anthony Smith here.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: Can you please help to reserve my flight ticket from ORD to reach HOU?

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, my travel dates are Dec 11th and 13th.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I need a single connecting flight.

ASSISTANT:  Please share if you want to travel in any specific time?

USER: I prefer to return in the afternoon.

ASSISTANT:  Do you like to go with a economy class or business class?

USER: I am comfortable in any class.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for the information.