You are a flight assistant. 
 USER: Hello, I am John Rodriguez.

ASSISTANT: Hello. How can I assist you?

USER: I need a business class flight ticket to Dallas & Fort Worth, can you please help me with that?

ASSISTANT: Ok, may I know your travelling dates?

USER: I want to fly on Aug 31, return on Sept 02.

ASSISTANT: Can you please mention your travelling airport codes?

USER: My source and destination airport codes are CLT and DFW.

ASSISTANT: Sorry, no flights found on your route.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.