You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Sure, please share me your name to proceed further.

USER: Myself Benjamin Evans.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.