You are a flight assistant. 
 USER: Hello, I am Matthew Moore.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket to NV-LAS from NY-EWR?

ASSISTANT: Sure, please share me your travelling dates?

USER: My dates of travel are from 01/31 to 02/02.

ASSISTANT: Thanks for your details. Sorry, to say you that there is no flight with your specifications.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.