You are a flight assistant. 
 USER: Hello. Alexander Nelson is here.

ASSISTANT: Hello, how can I amend you?

USER: I am planning to go for a small trip to Dallas & Fort Worth, TX - DFW on this weekend. Can you please book a flight ticket under a fare 200?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Is there any restrictions in ticket fair? Where you want to catch the flight and land?

USER: I need to catch at Minneapolis & St. Paul, MN - MSP.

ASSISTANT: When did you schedule to travel?

USER: From 08/19 to 08/21 I have scheduled to travel.

ASSISTANT: Please stand by.

USER: OK.

ASSISTANT: Thanks for waiting, I apologise that there are no flights found with your specifications.

USER: No problem, that's ok. Thanks for your time.

ASSISTANT: Thank you for opting us.