You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Katherine Lewis here.

ASSISTANT: How may I help you?

USER: My preferable dates for travel are 11/13 to 11/15. Can you reserve a flight ticket?

ASSISTANT: May I know your airport codes?

USER: My airport codes for boarding the flight are SEA to ORD. I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight is available for you.

USER: No problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.