You are a flight assistant. 
 USER: Hello, I am Melissa Nelson.

ASSISTANT: Hello, how may I support you?

USER: I wish to go to visit Minneapolis special attractions on 10/19. Could you please book a ticket with direct flight?

ASSISTANT: Ok, let me know your price limit?

USER: Price limit is 1000.

ASSISTANT: May I know your depart and arrival codes?

USER: Sure, I want to starts from DFW to MSP.

ASSISTANT: Could you please mention your arrival date?

USER: I already mentioned above. My return journey date is 10/21.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your given credentials.

USER: Ok, no problem.

ASSISTANT: Thanks for opting us.

USER: Thank you.