You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Ronald Martinez here. I would like to book a ticket from LAS to CLT, can you please help me with that?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: The travel dates are from 06/01 to 06/03.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome, have a great day.