You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you?

USER: Please book a ticket from Denver, CO-DEN to Dallas & Fort Worth, TX-DFW.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 09/21 to 09/23.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Do you need any lay by in between your journey?

USER: Connections limit is 1.

ASSISTANT: Sorry, no flights found on your preferable dates. May I know your name?

USER: My name is Carolyn Perez. Thanks for the assistance.

ASSISTANT: Most welcome.