You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amanda Evans.

ASSISTANT: How can I support you today?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for approaching us.