You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Pamela Nelson. I want to change my existing reservation due to postpone of my friend engagement.

ASSISTANT: Ok. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for choosing us.