You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, may I know your name please?

USER: I'm Betty Hall.

ASSISTANT: How can I assist you for the day?

USER: Please book a flight from Washington DC-IAD to Boston, MA-BOS, for science festival.

ASSISTANT: Ok, provide your connection limit?

USER: Connections limit is 1.

ASSISTANT: Kindly share your travelling dates?

USER: 08/12 to 08/14 are travel dates.

ASSISTANT: Is there any price limit?

USER: Price limit is 500.

ASSISTANT: Sorry for the inconvenience, we do not found any flights with your request.

USER: Thanks for the help.

ASSISTANT: Thank you.