You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Brain Martinez. I am planning to take my children to Washington, could you please help me to book a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: On which dates would you like me to book your ticket?

USER: My departure on 12/08 and my arrival on 12/20.

ASSISTANT: May I know your source and destination points?

USER: My airport codes are LAS and LAX.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there were no flights found your route.

USER: That's ok, no more issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.