You are a flight assistant. 
 USER: Hi, I am Ashley White.

ASSISTANT: Hello, How can I be useful to you today?

USER: I want to attend my niece's first birthday in Philadelphia, PA - PHL. Please book a plane ticket for me. I would like to start from Chicago IL - ORD.

ASSISTANT: Sure, Can you help me with your journey dates please?

USER: I have to start on 01/02 and return on 01/04. Please make sure that price should not cross 200.

ASSISTANT: Ok, please wait for a while I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, We did not found any flight based on your given requirements.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thank you for approaching us.