You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Karen Roberts. I am planning to visit History Colorado Center at Denver, CO-DEN. Can you please help me in booking a ticket from Seattle, WA-SEA?

ASSISTANT: Sure, I am here to help you. Please provide your journey dates.

USER: My journey dates are from 11/28 to 11/30. Please make sure that I need a connecting flight.

ASSISTANT: Ok, please wait for a while, I will check the availability of flights and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to say that we did not find any connecting flight based on your details.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.