You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Raymond Smith want to visit Washington, can you book a ticket from CLT to IAD?

ASSISTANT: May I know your travelling dates please?

USER: Ok, my travelling dates will be 07/14 and 07/16.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.