You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Nicholas Anderson. Due to sudden work so, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Nicholas Anderson, there is no reservation found under your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.