You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I serve you?

USER: Please provide a ticket to Denver, CO-DEN from Charlotte, NC-CLT.

ASSISTANT: Sure, can you help me with your journey dates?

USER: From 04/11 to 04/13 are travel dates.

ASSISTANT: May I know your name?

USER: I am Kimberly Lewis.

ASSISTANT: Sorry, no flights found on your given preferences.

USER: Thanks for the help.