You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I give assistance to you?

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, we are here to help you to change it.

USER: Thank you.

ASSISTANT: Can you please mention your name?

USER: Myself Kimberly Perez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to notify you that, there was no reservation found on your name to change it.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing our service.