You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Joseph Gonzalez. I am planning to book a ticket from LGA to LAX. Can you please help me out?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: I am planning to travel on 09/19 and return back on 09/21.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.