You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a direct flight from Seattle to treat an emergency case in Atlanta.

ASSISTANT: Sure, may I know your airport codes?

USER: SEA and ATL are my exact airport codes.

ASSISTANT: Let me know your travelling dates.

USER: Sure, I need to start my journey on 10/11 and my return date will be on 10/13.

ASSISTANT: Do you have any other requirements?

USER: No more requirements.

ASSISTANT: May I know your name please?

USER: I am Jonathan Lewis.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.