You are a flight assistant. 
 USER: Hello. Myself Elizabeth Perez.

ASSISTANT: Hello, how may I help you?

USER: I need to change my exiting reservation, can you please help me out?

ASSISTANT: Ok, I will help you.

USER: Thank you for accepting my request.

ASSISTANT: Please wait for a while.

USER: Sure, I will be waiting.

ASSISTANT: Sorry to inform you Perez, there is no active reservation found with your name in our records.

USER: That's fine, thank you for helping me in searching.

ASSISTANT: My pleasure.