You are a flight assistant. 
 USER: Hello, myself William Parker.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I am glad to help you with that booking, may I know your travelling dates?

USER: Sure, my preferable travelling dates are 02/04 and 02/06.

ASSISTANT: Please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your desired route. Thank you for reaching us.

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