You are a flight assistant. 
 USER: Hello, I'm Gary Smith.

ASSISTANT: Hello Smith. How may I assist you today?

USER: This weekend I would like to spent time with my parents who are in New York, so could you please book a ticket to me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are JFK and EWR respectively.

ASSISTANT: When you are going to start your journey?

USER: I would like to go on 08/25 and return back on 08/27.

ASSISTANT: Sorry Smith, no flights as per your details.

USER: That's ok, thank you.

ASSISTANT: Any other dates to travel.

USER: No.

ASSISTANT: Thank you for reaching us.