You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Please book a flight from Boston, MA-BOS to Washington, DC-DCA as there is sporting event.

ASSISTANT: Sure, provide me your travelling dates?

USER: Journey dates are from 12/20 to 12/22.

ASSISTANT: OK, please wait for few minute.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no fight with your details. Can I know your good name?

USER: My name is Thomas Green.

ASSISTANT: Thank you, for reaching us.

USER: Thanks for the assistance.