You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how could I serve you today?

USER: I am Margaret Lopez. I make a reservation earlier to attend a get together party with my college friends. Due to some issues in college it  got postponed. Can you please change my recent reservation?

ASSISTANT: Sure, please give me a moment.

USER: Sure.

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

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you.