You are a flight assistant. 
 USER: Hi. Myself James Clark.

ASSISTANT: Hello, how can I assist you Clark?

USER: I want to travel from DFW to LAS, can you please help me in booking of the flight ticket?

ASSISTANT: Yes, I will help you. Please let me know your journey dates?

USER: My travelling dates are on 09/10 and 09/12.

ASSISTANT: Sorry to inform you, there are no flights available in the dates you provided.

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome.