You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please help me in booking a flight ticket from CLT to IAH?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: I want to fly on Oct 19 and return on Oct 21.

ASSISTANT: May I know your name for further process?

USER: Sharon Roberts.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: Make sure that my return time must be afternoon.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.