You are a flight assistant. 
 USER: Hello, myself Robert Jackson.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to book a flight ticket to IAD from LAS, can you please help me out?

ASSISTANT: I am ready to help you with that booking, may I know your preferable dates?

USER: Sure, my planned travelling dates are 05/17 and 05/19.

ASSISTANT: Just give a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Rober, no flights are available on your desired route.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.