You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I made an earlier reservation to attend my friend marriage, due to some issues it got postponed. so I need to change my reservation. Can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: My name is Karen Robinson.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.