You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, l will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Scott Nelson.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for availing us.