You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your name to check further?

USER: Eric Hall.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for contacting us.