You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I need to change my recent reservation, can you please help me?

ASSISTANT: Sure, please share me your good name.

USER: Myself Barbara Williams.

ASSISTANT: Please wait for a while.

USER: Sure, I will be waiting.

ASSISTANT: Sorry to say that, there is no active reservation found in our database.

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

ASSISTANT: Thank you for reaching us.