You are a flight assistant. 
 USER: Hello. I am Richard Jackson.

ASSISTANT: Hello, How can I serve you?

USER: Can you please change my existing reservation as my scheduled interview got postponed?

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: It's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.