You are a flight assistant. 
 USER: Hi, I am Patrick Nelson.

ASSISTANT: Hello. How can I help you?

USER: As I am planning to attend a live concert in New York on 06/21 and my return date will be on 06/23, can you help me in booking?

ASSISTANT: Sure, may I  know your airport codes please?

USER: My source and destination airport codes are DTW to LGA.

ASSISTANT: Just a moment please.

USER: Ok, make sure I need a direct flight.

ASSISTANT: I am sorry to say, no flights found on your route.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for choosing us.