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

ASSISTANT: Hello, how may I help you?

USER: Can you please help me with booking a flight ticket from LAS to DFW?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are from Jun 26 to Jun 28.

ASSISTANT: Do you need any other requirements?

USER: I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights found on your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.