You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How best can I give you the assistance?

USER: Actually I prefer only business class flight ticket unfortunately my friend booked a ticket under economy class so, I want to modify my reservation for a business class. Can you be my assistance in this?

ASSISTANT: Sure, I will help you with that.

USER: Ok, thank you.

ASSISTANT: To modify your reservation, we need your name. Can you provide it?

USER: Sure, my name is Frank Hall.

ASSISTANT: Thanks for the name, please be patience.

USER: OK.

ASSISTANT: Thanks for being patient. Sorry Frank Hall, we did not find any active reservation on your name to change it.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for choosing us in modifying your reservation.