You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation as my plan to visit Denver is postponed. Can you change my reservation?

ASSISTANT: Sure, I will help you with that. May I know your good name please?

USER: My name is Ashley Smith.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.