You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit a Liberty Bell in PHL from DTW. Can you find a ticket for me?

ASSISTANT: Sure, will you provide your travelling dates please?

USER: Ok, my planned dates are 06/27 to 06/29.

ASSISTANT: Please give me a moment. May I know your name for booking the ticket?

USER: Ok, make sure that the connection limit is  1. Yes, I am Margaret Green.

ASSISTANT: Unfortunately, there is no flights with connections 1.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.