You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My trip has been postponed and now I want to change my reservation. Can you please help me?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Edward Lopez.

ASSISTANT: Sorry, there is no reservation found on your name in our data base to change.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.