You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Ashley Lewis.

ASSISTANT: Yes, Lewis.

USER: I am planning to travel Las Vegas from ORD to LAS.Can you help me out?

ASSISTANT: Sure, I am here to help you out. May I know your dates of travelling?

USER: There are my travelling dates 07/25 to 07/27.

ASSISTANT: Sorry, no flights found on your requirement.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you.