You are a flight assistant. 
 USER: Hello, I am Joshua Miller.

ASSISTANT: Hello. How may I guide you today?

USER: I need a direct to go for roundtrip with my parents.So, can you book a flight ticket on 08/12?

ASSISTANT: Sure. Please provide me your return date.

USER: I intend to return my trip on 08/14.

ASSISTANT: Could you please provide me your airport code?

USER: Dallas & Fort Worth, DFW is my airport code.

ASSISTANT: Thanks for your details, there is no flight found on your details.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.