You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to book  flight ticket from DEN to SEA for attending a seminar.

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My travelling dates are Mar 19 and Mar 21.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer to travel in a direct flight.

ASSISTANT: Is there any other specifications?

USER: No, I do not have any other specifications.

ASSISTANT: May I know your name?

USER: I am Barbara Wright.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.