You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit a trip to Seattle SEA. Could you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, may I know your itinerary dates?

USER: My journey dates are from 04/18 to 04/20.

ASSISTANT: Please hold on for a while.

USER:  Sure.

ASSISTANT: May I know your name?

USER: Sure, myself Virginia Thompson.

ASSISTANT: Sorry Virginia, no flight is available on your route.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.