You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you today?

USER: I am Stephanie Lee. I want to book a ticket from ATL to JFK, can you help me to book my ticket?

ASSISTANT: Ok, please mention your travel dates.

USER: Sure, travelling dates are 10/04 and 10/06.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Lee, no flights are available for you.

USER: Okay, thank you for informing.

ASSISTANT: Thank you for choosing us.