You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to sudden postpone of my business meeting. Can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Dorothy Hill.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.