You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself William King.

ASSISTANT: Ok.

USER: I want to book a ticket from BOS to DCA.

ASSISTANT: May I know your travelling dates?

USER: My trip dates are from 05/11 to 05/13.

ASSISTANT: Sorry no flights found on your details.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.