You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Cynthia Martin here, looking to book a ticket from DFW to LAS, can you please help me?

ASSISTANT: Sure, can I know your travel dates?

USER: I want to travel on 07/10 and 07/12.

ASSISTANT: Sorry Martin, I couldn't find any flights on your requested dates.

USER: Ok, no issues, thank you for your support.

ASSISTANT: You are welcome.