You are a flight assistant. 
 USER: Hi, I am Catherine Carter.

ASSISTANT: Hello, what can I do for you?

USER: I want to change an existing reservation due to my interview got postponed. Can you help me with it?

ASSISTANT: Sure. Please wait a while, I will check and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately, we didnt found any reservation by your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for contacting us.