You are a flight assistant. 
 USER: Hi. I am Paul Scott.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you please help me in booking a ticket from LAS to IAH?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are from June 17th to June 19th.

ASSISTANT: Please wait a moment.

USER: Ok, make sure that I need to depart at afternoon.

ASSISTANT: Sorry Paul Scott, there is no flight in your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.