You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Sarah Lee.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.