You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to attend live music concert at Phoenix, can you please reserve flight ticket from LAS to PHX?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my planned travelling dates are May, 12 and May, 14 respectively.

ASSISTANT: Do you have any other specifications?

USER: I would be comfortable with single connection.

ASSISTANT: May I know your name please?

USER: Sure, my name is Stephen Allen here.

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

USER: That's ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for opting us.