You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Alexander Walker. Please help me in booking a flight ticket from PHX to PHL.

ASSISTANT: May I know your desired travel dates please?

USER: My travel dates are from Nov, 16 to Nov, 18.

ASSISTANT: Do you have any specifications?

USER: I need to return in the afternoon and I need a single connecting flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Nothing to worry, thanks for your information.

ASSISTANT: Thank you for opting us.