You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your assistance?

USER: I want to change an existing reservation due to some issues, can you please help me?

ASSISTANT: Sure, we are always at your end to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Michelle Evans here.

ASSISTANT: Please wait a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for your time, we did not find any active reservation to make changes further as per your request.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.