You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Dorothy Green, I want to book a direct flight to New York to visit my grand father. Can you help me to book a flight with in 5000?

ASSISTANT: Sure, may I know your journey dates?

USER: I will fly on 06/09 and return on 06/11.

ASSISTANT: Please provide me your source and destination codes.

USER: My source airport code is MA-BOS and destination is NY-EWR.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.