You are a flight assistant. 
 USER: Hello, I am Brenda Evans.

ASSISTANT: Hello, how can I serve you?

USER: I want to reschedule my existing reservation as my interview got postponed. Can you help me out with it?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found in your name.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.