You are a flight assistant. 
 USER: Hello, I am Debra Wright.

ASSISTANT: Hello, how could I assist you?

USER: I want to alter my reservation, due to postponement of concert to be held at the place where I wanted to visit. Can you please take your time helping me with change my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.