You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Dorothy Lewis.

ASSISTANT: Ok.

USER: Can you help me in booking a flight ticket from MCO to SEA?

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to fly on Sept 22 and return on Sep 24.

ASSISTANT: I am sorry, there are no flights available.

USER: Not an issue. Thank you.

ASSISTANT: Thank you, have a good day.