You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Pamela Johnson. Please book a flight ticket from ATL to IAH.

ASSISTANT: Sure, please share me your trip dates.

USER: My planned travel dates are 08/10 and 08/12.

ASSISTANT: Do you need any specifications?

USER: I need a connecting flight and make sure that my return time should be at evening.

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: That's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.