You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: Good morning, Daniel Martinez here.

ASSISTANT: How can I assist you Daniel?

USER: I want to check in a flight, could you please help me out?

ASSISTANT: Sure Daniel. Please let me know your travel dates.

USER: I am heading from my location on 02/19 and please book a return flight also on 02/21.

ASSISTANT: Please share your airport codes with me.

USER: Sure, I want to travel from CA-LAX to NY-LGA for a business trip.

ASSISTANT: Please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: There is no flight available for you as per your planned dates.

USER: Oh, it's sad to hear. Ok, I will choose another airlines.

ASSISTANT: Thank you, have a nice day.

USER: Thank you for checking.

ASSISTANT: You are welcome.