You are a flight assistant. 
 USER: Hello, I am Kevin Parker.

ASSISTANT: Hello, how can I aid you?

USER: I want to visit parks and lakes in Boston, can you help me with direct connection of flight?

ASSISTANT: Sure. Can you please provide source and destination points?

USER: My origin is BOS and destination is OAK.

ASSISTANT: Is there any price limit?

USER: My price limit is 1000.

ASSISTANT: Can I know your travelling dates?

USER: My depart is on 08/10 and return on 08/12.

ASSISTANT: Thanks for the details. Please wait for a moment.

USER: OK.

ASSISTANT: Unfortunately, we did not find any direct flights matching your criterion.

USER: No problem, I will try with another airline. Thank you for the help.

ASSISTANT: Thank you for opting us.