You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your service?

USER: I am Dennis Anderson and I want to reach Chicago to participate in badminton tournament, can you help me to book a direct flight?

ASSISTANT: Sure. Please let me know your airport codes.

USER: My airport codes are from TX-DFW to IL-ORD.

ASSISTANT: Kindly share your travelling dates.

USER: I will depart on 09/11 and I intend o return on 09/13.

ASSISTANT: Thank you for sharing your details.

USER: Ok.

ASSISTANT: There are no direct flights found according to your requirement.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.