You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What help that I can aid you?

USER: I am Alexander Hernandez. I am looking for a flight from LAS to ATL, can you help me out?

ASSISTANT: Sure, I can help you in flight ticket booking and may I know your departure and arrival dates of your journey?

USER: My trip dates are from 04/15 till 04/17.

ASSISTANT: Thank you for providing the information, I have checked based on your request but no flight is moving on your journey dates to book the ticket.

USER: That's ok, no problem. Thank you for your information.