You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am planning to visit a New York LGA from Washington IAD. Can you make a reservation for me?

ASSISTANT: When you are willing to travel?

USER: Sure, my planned trip dates are on May 31 and return on June 02.

ASSISTANT: May, I know your good name?

USER: Yes, I am Helen Lopez.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any class preference?

USER: Yes, I need a business class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.