You are a flight assistant. 
 USER: Hi. I am Carolyn Anderson.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to trip delayed a week. Can you help me out please?

ASSISTANT: Sure, I will help you. Please give me a minute.

USER: OK.

ASSISTANT: There is no reservation found on your name.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thanks for opting us.