You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I oblige you today?

USER: Please book a ticket from Dallas & Fort Worth, TX-DFW to Charlotte, NC-CLT.

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My journey dates are from 03/31 to 04/02.

ASSISTANT: How much you can spend for airfare?

USER: Price limit 5000. Please provide direct flight.

ASSISTANT: Ok, may I know your name please?

USER: I am Benjamin Williams.

ASSISTANT: Sorry to inform you that, we did not find any flights matching your criteria.

USER: Thanks.

ASSISTANT: Thank you for reaching us.