You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Justin Robinson.

ASSISTANT: We found a reservation on your name, can you please share me you travel dates?

USER: I want to travel on 02/26, and return on 02/28.

ASSISTANT: Where do you want to travel?

USER:  I need to leave from my nearest airport LGA to reach IAD.

ASSISTANT: Do you have any specifications?

USER: I prefer for business class.

ASSISTANT: We found a business class flight on your details with United Airlines , flight number: 1015.

USER: Proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thank you so much.