You are a flight assistant. 
 USER: Hello. I'm Laura Taylor.

ASSISTANT: Hello. How can I help you with today?

USER: I want to travel from DEN to DFW, help me out in booking a ticket?

ASSISTANT: Sure, I can help you with that. Laura, can you please provide the travelling dates?

USER: My travel dates are 07/21 and 07/23.

ASSISTANT: Let me check that for you. I'm really sorry to inform you that there is no flight available at your request.

USER: It's fine. Thank you for your help.

ASSISTANT: You're welcome. Thank you for contacting us.