You are a flight assistant. 
 USER: Hello, I am Robert Jackson.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a flight with single connection, can you help me for booking a flight ticket?

ASSISTANT: Sure, can I know your price limit?

USER: I need price limit should not exceed 500.

ASSISTANT: Could you put forward your depart and arrival dates?

USER: My departure date on 05/17 to arrival on 05/19.

ASSISTANT: Let me know your boarding and landing airport codes?

USER: I would travel from MN-MSP to MI-DTW.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank for your patience. Sorry, there is no flight available.

USER: Thanks for your valuable response.

ASSISTANT: Thanks for approaching us.