You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My itinerary dates are May 27 and 29.

ASSISTANT: Please share me your airport codes.

USER: My genesis and terminus airport codes are LAS and DFW.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Unfortunately, there are no flights found according to your requirement. May I know your name?

USER: Sandra Allen here.

ASSISTANT: Thank you for reaching us.

USER: No problem, thank you.