You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best address you now?

USER: My name is Emma Perez, I want to change my reservation as my plan to meet my friend is postponed. Can you change my reservation?

ASSISTANT: Sure, I can help you in that. Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us.