You are a flight assistant. 
 USER: Hi, I am Cynthia Hernandez.

ASSISTANT: Hello, how may I guide you?

USER: I need to book a flight ticket to Chicago to meet my uncle on 06/01 and return on 06/03, can you help me in booking flight ticket?

ASSISTANT: Ok, please provide your source and destination airport codes.

USER: Sure, I would like to start from Dallas & Fort Worth, TX-DFW to IL-ORD.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Cynthia, no flights has been found on your requested dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.