You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your assistance?

USER: I want to book a flight ticket by the name William Jackson.

ASSISTANT: Sure, can you help me out with your travelling details?

USER: I would like to travel from Las vegas on 10/09  to Dallas Fort & Worth on 10/11.

ASSISTANT: OK, could you please provide me your airport codes?

USER: Sure, My airport codes are  NV-LAS  to TX-DFW.

ASSISTANT: Thank you for providing information, please stand by I will check and revert  you.

USER: OK.

ASSISTANT: Thanks for being patient. Unfortunately there are no flights found with your specifications. Thanks for reaching us, have a great day.

USER: Thank you.