You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me in finding a flight from BOS to LGA?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates will be Nov 13th to Nov 15th.

ASSISTANT: Do you want to fly out of business class or economy class flight?

USER: I am ok, with any class.

ASSISTANT: May I know you name?

USER: I am Jonathan Brown.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I prefer a flight that should depart in the evening.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Jonathan Brown, based on your desired specifications, we haven't found any flights in airline database.

USER: Not a problem, thank you.

ASSISTANT: Thanks for contacting us.