You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sharon Thomas.

ASSISTANT: How can I assist you today?

USER: I have a plan to attend a Music Concert Denver, can you help me for booking a flight ticket from DFW to DEN?

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

USER: My travelling dates are from 12/16 till 12/18.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.