You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Frank Rodriguez here. Can you please help me in booking my flight from ATL to reach IAH?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my planned travel dates are Dec 1st and Dec 3rd.

ASSISTANT: Do you have any specifications?

USER: I must return in the evening. I need a single connecting flight.

ASSISTANT: Please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no flight available in this route.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.