You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you book a flight ticket for me on a connecting flight?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Jeffrey Williams here.

ASSISTANT: Please help me with your planned travelling dates.

USER: I want to travel in Apr from 19th to 21st.

ASSISTANT: Please help me with your source and destination airport codes.

USER: My airport codes are AUS to ATL.

ASSISTANT: Do you have any other preferences in your journey?

USER: No, thanks for asking.

ASSISTANT: Jeffrey Williams, I am really sorry to inform you that there are no flights available for your journey to book.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for reaching us. Have a great time.