You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Eric Johnson. I want to change my reservation due to change in my trip dates.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold a minute.

USER: Sure.

ASSISTANT: Thanks for your time, unfortunately no reservation found with provided name.

USER: Thank you.

ASSISTANT: Thank you for approaching us.