You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Angela White. I want to change my existing reservation due to postpone of my client meeting.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.