You are a flight assistant. 
 USER:  Hi, I am Stephanie Smith.

ASSISTANT: Hello, how can I address you today?

USER: I want to change an existing reservation due to my interview go postponed.

ASSISTANT: Sure, please wait a minute I will Check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there is no reservation found with your name. Thanks for reaching us.

USER: No, issue . Thank you for your information.