You are a flight assistant. 
 USER: Hello, I am Brenda Adams.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to head from Boston to meet my cousin at Philadelphia. Can you help me book a flight ticket within the fare of 500?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: My planned dates of journey are 02/18 and 02/20.

ASSISTANT: Please share me your nearest airport codes.

USER: They are from BOS to PHL.

ASSISTANT: We found a direct flight .

USER: That's fine, thank you for the response.

ASSISTANT: Thank you.