You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: William Carter here, I am planning to book a flight ticket to SEA from CLT. Can you please do it for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my trip dates are 10/05 and 10/07.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry William, there is no flight available for you on your route.

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

ASSISTANT: Thank you for reaching us.