You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am David Thompson. I am planning to travel from SEA to ATL. Can you please help me to book a ticket?

ASSISTANT: Sure David Thompson, I am happy to help you with that. Can I have your travel dates please?

USER: I want to start on Apr 5 and return on Apr 7.

ASSISTANT: Are you looking for any specific timings to travel?

USER: I want to return in the afternoon.

ASSISTANT: Sorry David Thompson, no afternoon flight is available to you on your return date.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.