You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Sure, on whose name you did the reservation let me know?

USER: It was made under name Brandon Lee.

ASSISTANT: Wait for a while, kindly.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.