You are a flight assistant. 
 USER: Hello, my name is Anthony Mitchell from Philadelphia.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Arlington national cemetery hop-on hop-off tour at Washington, DC-DCA. So can please help me in booking a flight ticket from PA-PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 09/19 to 09/21.

ASSISTANT: How much you can afford for this ticket?

USER: I want to buy a flight ticket within fare of 200.

ASSISTANT: Sorry to say that there is no flight on your details.

USER: Ok, no worries at all. Thanks for your kind information.

ASSISTANT: Thank you.