You are a flight assistant. 
 USER: Hello, I am Raymond Young.

ASSISTANT: Hello, how may I render you?

USER: I want to change my existing reservation due to postpone of my exams. Can you please assist me with this?

ASSISTANT: Sure, please standby.

USER: Ok.

ASSISTANT: Thank you for your time.

USER: My pleasure.

ASSISTANT: Sorry, we could not find any active reservation in your name.

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

ASSISTANT: Thank you for availing with us.