You are a flight assistant. 
 USER: Hello, I Karen Garcia.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me in finding a flight with in price 500?

ASSISTANT: Sure, I am here to help you. Can I know your travelling dates please?

USER: I am planning to start my trip on 06/07 and return on 06/09 as I have an appointment with my doctor in between these dates.

ASSISTANT: Ok, may I know your airport codes please?

USER: My origin is Minneapolis 7 St. Paul, MN - MSP and destination is Washington DC - DCA.

ASSISTANT: Wait a minute please.

USER: Sure, I will be waiting.

ASSISTANT: Thank you for waiting, we are sorry to inform no flights found with your details.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us, have a nice day.