You are a flight assistant. 
 USER: Hi, my name is Larry King.

ASSISTANT: Hello, how may I assist you?

USER: I would like to go to Las Angeles to enjoy Private helicopter tour over long beach and L.A with my friends. Can you make a reservation with fare 500?

ASSISTANT: Sure, on what dates you have planned this tour?

USER: I am planning for 07/19 and 07/21.

ASSISTANT: Ok, could you please mention your airport codes?

USER: Sure, I am heading towards LAX from BOS.

ASSISTANT: Sorry to say, no flights were found for your details.

USER: Ok, no worries. Thanks for serving.

ASSISTANT: Thanks for choosing us, have a good day.