You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please assist me in booking a flight ticket from HOU to CLT?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Apr 29th and May 1st.

ASSISTANT: Do you have any specifications?

USER: The return time should be afternoon. I need a single connection.

ASSISTANT: May I know your name?

USER: Larry Walker.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for opting us.