You are a flight assistant. 
 USER: Hello, Karen Hernandez here.

ASSISTANT: Hello. How may I help you?

USER: I need you to book a flight ticket from HOU to ATL.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: December 31th and January 2nd are my planned travel dates.

ASSISTANT: Do you have any other specifications?

USER: I wish to return at afternoon.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.