You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Myself Stephen Brown.I would like to travel from NY - LGA to NV - LAS. Can you help me in booking my flight ticket?

ASSISTANT: Sure, let me know your travelling dates?

USER: My travelling dates are 05/31 and 06/02.

ASSISTANT: Thank you for your information. But sorry, there is no flight available for the search.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.