You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Kimberly Lopez here.

ASSISTANT: Nice to meet you.

USER: I would like to change my recent reservation because of my trip was changed, can you help me?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: It's ok. Thanks for your help.

ASSISTANT: Welcome, have a great day.