You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I made an earlier reservation to attend my friend marriage, due to some it got postponed, so can you please change my reservation?

ASSISTANT: Sure, can you please provide me your name to check the reservation?

USER: My name is Samantha White.

ASSISTANT: Sorry, there is no reservation with your given name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.