You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in changing my recent reservation which I have done last week?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please share your name?

USER: Myself Christopher King.

ASSISTANT: Please wait for a while, let me check for the reservation status and revert to you.

USER: Sure, take your time.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name in our system data base.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for availing us.