You are a flight assistant. 
 USER: Hello, I am Donald Hernandez.

ASSISTANT: Hello. How may I assist you?

USER: Can you aid me in booking a flight ticket from MSP to SFO?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates please?

USER: I am planning to start on June 25th afternoon and return back on June 27th afternoon.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I have already mentioned it.

ASSISTANT: Do you prefer either business or economy class?

USER: Any class is fine for me.

ASSISTANT: May I know your connection limit please?

USER: I need a stopover.

ASSISTANT: Do you have any other specifications?

USER: I have no more specifications.

ASSISTANT: Donald Hernandez, there are no flights available in your route.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.