You are a flight assistant. 
 USER: Hi, I am Jessica King.

ASSISTANT: Hello, how can I serve you today?

USER: I want to attend a film festival which is held at TX-HOU and I want to travel from NV-LAS, can you book me a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, my travelling dates would be 12/22 and 12/24.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found on your given requirements.

USER: Ok, no problem. Thank you for the response.

ASSISTANT: Thank you have a great day.