You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am searching a flight from Philadelphia to Chicago to attend my friend marriage. Can you help me in this?

ASSISTANT: Sure, provide me your travelling dates?

USER: Ok, my travelling dates are 05/26 is my start date and 05/28 is my return date.

ASSISTANT:  Help me with your travel points?

USER: Sure, Philadelphia, PA - PHL is my source airport code and Chicago, IL - ORD is my destination airport code.

ASSISTANT: Ok, please wait I will revert you. Sorry to say that no flights are available on your travel dates.

USER: Ok, no problem. Thank you for your kind response.

ASSISTANT:  May I know your good name?

USER: Melissa Lopez is my name.

ASSISTANT:  Thank you for availing us.