You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I aid you for today?

USER: I am Nicholas Young, can you help me finding flights from LAS to LGA to attend my friend's birthday party?

ASSISTANT: Can you please let me know your planned dates of travel?

USER: I am going to start my travel on 09/06 and I am going to return on 09/08.

ASSISTANT: Sorry Young, there is no flight to travel your destination on your preferable dates.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Ok, thank you for choosing our service. Hope you have a great day ahead.