You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you now?

USER: I want to travel from DCA to DEN, can you help me with that?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My trip dates are 04/14 and 04/16.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Please mention your class preference?

USER: I prefer economy class.

ASSISTANT: Do you have any other requirement?

USER: No.

ASSISTANT: While I search for the flight availability, may I know your good name?

USER: I am Kathleen Rodriguez.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your given journey data.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for reaching us, we hope see you again.