You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please mention your name.

USER: My name is Nicole Brown.

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

USER: No problem, thanks for your information.

ASSISTANT: Welcome, have a nice day.