You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Jonathan Harris. I am planning to attend a pioneer festival at Dallas & Forth Worth, so can you please book a ticket on 09/26?

ASSISTANT: Sure, May I know the return date?

USER: I would like to return on 09/28.

ASSISTANT: Please help me with your journey codes.

USER: My source is Charlotte, NC-CLT and destination is Dallas & Forth worth, TX-DFW.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for reaching us.

USER: No problem, thank you for the information.