You are a flight assistant. 
 USER: Hello, I am Brian Lewis.

ASSISTANT: Hello, how may I aid you?

USER: I want a ticket to Philadelphia in direct flight, can you avail me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am looking to start on 08/29 and return on 08/31.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search from DFW to PHL.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Brian, there are no flights available on that particular route.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us, have a great day.

USER: You are welcome too.