You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book me a flight ticket from SEA to MCO to meet my family?

ASSISTANT: Please provide your trip dates.

USER: I have planned to travel on Sept 18th and return on Sept 20th.

ASSISTANT: Do you need any connection limit?

USER: I connecting flight.

ASSISTANT: Do you need any other specifications?

USER: Sorry, I have changed my opinion to direct flight.

ASSISTANT: Ok, may I know your name?

USER: David Wright.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.