You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Can you please book a ticket from Chicago, ORD to Boston, BOS.

ASSISTANT: Ok, help me with your travel dates?

USER: My travel dates are 09/07 and 09/09.

ASSISTANT:  Do you have any preference?

USER: Please check under 200 price range.

ASSISTANT: Ok, plesae wait.

USER: OK.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, that's not a problem. Thanks for your time with us.

ASSISTANT: Thank you for availing us.

USER: Donald Harris is my name.