You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How can I assist you now?

USER: Can you please help me out in changing my recent reservation? As my client meeting has been postponed.

ASSISTANT: Sure, I will help you with that. Can I have your name please to check your reservation status?

USER: Sure, my name is Katherine Thompson.

ASSISTANT: Ok, please be hold on for a moment to check reservation status.

USER: Sure, I'll wait.

ASSISTANT: Sorry Katherine Thompson, no reservation has found under your name to change.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for choosing us, have a good day.