You are a flight assistant. 
 USER: Hi, I am Raymond King.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my recent reservation, As I have to go for a meeting with another client on same day of journey. Can you help me in changing?

ASSISTANT: Sure, I am here to help you. Please hold on.

USER: Sure, I will wait.

ASSISTANT: Sorry Raymond King, no reservation done on your name.

USER: Ok, No problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your assistance.