You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today at this moment?

USER: Can you help me in booking a flight ticket from DEN to CLT?

ASSISTANT: Sure, to book a ticket can I know your journey dates?

USER: I want to travel on 11/17, and return on 11/19.

ASSISTANT: Please let me know, If you have any other preferences?

USER: I prefer for normal cost airline.

ASSISTANT: May I know your name please?

USER: I am Thomas Walker.

ASSISTANT: Unfortunately there are no flights are running on your route according to your given dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.