You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I have a concert  to attend, so could you help me to book a  ticket from DTW to BOS.

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are 07/21 and 07/23.

ASSISTANT: Can I know your class preference?

USER: I would like to board a connecting flight with economy class.

ASSISTANT: May I know your name?

USER: Carolyn Lopez here.

ASSISTANT: Sorry, no flights found on your route.

USER: No issue, thank you for the time.

ASSISTANT: Thank you for reaching us.