You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need you to book a flight ticket from SEA to ATL. Please help me.

ASSISTANT: Sure, may I know your travel dates?

USER: September 16 and 18 are my planned travelling dates.

ASSISTANT: Do you have any specifications?

USER: I wish to return in the afternoon.

ASSISTANT: Please share me your name.

USER: My name is Angela Perez.

ASSISTANT: Sorry, there is no flight at this moment.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for opting us.