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

ASSISTANT: Hello, How can I help you?

USER: I am planning to meet my childhood friend at Chicago. Help me in booking my flight ticket within the price limit of 200.

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are from MA-BOS to IL-ORD.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates will be from 11/01 to 11/03.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No problem, thank you for your help.

ASSISTANT: Thank you.