You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: I would like to attend my friend wedding anniversary, could you please help me in booking a ticket?

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

USER: My preferable travel dates are from 07/16 to 07/18.

ASSISTANT: Could you please provide the airport codes?

USER: My airport codes are from DFW to LGA.

ASSISTANT: May I know your name to proceed further?

USER: My name is George Lopez.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure, take your time.

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

USER: Ok, no problem, thank you for your response.

ASSISTANT: You are welcome. Thank you for contacting us.