You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change an existing reservation due to my interview got preponed.

ASSISTANT: Ok, may I know your good name please?

USER: I am Amanda Thompson.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately we found no reservation against your name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.