You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Hill.

ASSISTANT: How can I assist you today?

USER: I planned to meet my cousin in PHX, can you please help me to book a flight ticket from LGA?

ASSISTANT: Sure, can you please share your travel dates?

USER: I prefer to travel on 08/26 and 08/28.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Patrick, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a great day.