You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Nicholas Lopez. I am planning to visit LAS to meet my brother, can you please find a flight from OAK?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My planning dates are from 02/03 till 02/05.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Lopez. No airlines are providing service on your route.

USER: That's ok, thank you for checking.

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

USER: Welcome.