You are a flight assistant. 
 USER: Hello, I am Linda Martinez.

ASSISTANT: Hello, how can I assist you?

USER: as I did an reservation in past, Due to some issues my schedule got postponed. Can you help me in changing my reservation.

ASSISTANT: Sure, we are gleeful to help you. Please hold on.

USER: Sure.

ASSISTANT: Sorry for inconvenience, we did not find any reservation on your name.

USER: Ok, Thank you for information.

ASSISTANT: Thanks for reaching us, have a good day.