You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to change my existing reservation due to my family issue, can you please help me out?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Rachel Hill here.

ASSISTANT: Thank you for providing your name, please wait for a minute.

USER: Sure, I will wait.

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

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thank you for availing us.