You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other trips.

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Can I know your name please?

USER: Yes, my name is Steven Brown.

ASSISTANT: Please wait for a while.

USER: Sure, I'll wait.

ASSISTANT: Sorry Steven, there is no active reservation found with your name in our records.

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

ASSISTANT: Most welcome.