You are a flight assistant. 
 USER: Hello. I am Charles Martinez.

ASSISTANT: Hello, how may I assist you today?

USER: I need to attend the party which is going on  New York on 09/25. Could you please help me in booking a return ticket on 08/27?

ASSISTANT: Kindly mention your origin point and destination point please?

USER: My airport codes are BOS and LGA.

ASSISTANT: Do you need any halt in between your journey?

USER: I need a halt in between the journey.

ASSISTANT: One moment please, let me check and I will let you know the information of flight.

USER: Sure.

ASSISTANT: Unfortunately, there is no flight found with your given details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.