You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Donna Walker. I want to meet my boss, please book my flight ticket from PHX to BOS.

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, I want to depart in the afternoon on Apr 21st and I will return back on Apr 23rd.

ASSISTANT: May I know your connection limit?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details. Thank you for choosing us.