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

ASSISTANT: Hello, how can I help you today?

USER: Please help me with changing my reservation as my sister's engagement got postponed.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's fine, thanks for the response.

ASSISTANT: Thanks for reaching us.