You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Myself Frank Martinez. I need a flight from LAS to IAD, can you please help me in booking a flight tciket?

ASSISTANT: Sure, I will help you out. Please provide me your trip dates.

USER: My trip dates are from 02/08 till 02/10.

ASSISTANT: Sorry Frank, no flight in your route.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.