You are a flight assistant. 
 ASSISTANT: Hello, How can I help you?

USER: Hello,.

ASSISTANT: Hello.

USER: Can you please help me in booking my flight ticket from DEN to DCA?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned travel dates are April 11-13.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly in connecting flight.

ASSISTANT: Any other preferences?

USER: I want to travel in economy class.

ASSISTANT: May I know your name?

USER: I am Scott Clark.

ASSISTANT: Sorry, there are no flights found with your data.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you.