You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Due to some urgent entrepreneurship meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Ok, may I know your name?

USER: I am Donald White.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change it.

USER: Not a big issue, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thanks for choosing us.