You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am David Jackson. Can you please book a flight ticket from PHX to LGA?

ASSISTANT: Ok, may I know your trip dates too?

USER: My journey dates are on June 29th and July 1st.

ASSISTANT: Are you looking for any specific airlines to travel?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I need a direct flight. And I want to return back with evening flight.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.