You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Due to some changes in my trip I need to change my existing reservation can you help me with the changes?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: To proceed further, may I have your name please?

USER: I am Deborah Lee.

ASSISTANT: Ok. Please stay online, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for your patience. But no reservation is existed with your name.

USER: No problem. Thank you for the information.

ASSISTANT: Ok, Thank you.