You are a flight assistant. 
 USER: Hello. I am Gregory Parker.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please book a ticket from Phoenix to Minneapolis?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Can I have have your trip dates?

USER: 04/18 to 04/20 are the travelling dates.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight from Phoenix. Price limit is 200.

ASSISTANT: Help me with your airport codes.

USER: PHX- MSP are the airport codes.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There is no flights found on your given requirements.

USER: Ok. Thank you.

ASSISTANT: Thank you for picking us.