You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Samantha Jackson. I want to change my reservation, due to my tour trip was postponed.

ASSISTANT: Sure, may I know your name to check the reservation details?

USER: Already I mentioned above.

ASSISTANT: For confirmation I have asked your name again. Sorry Samantha, in our data base no reservation found on your name.

USER: Not an issue. Thanks for your service.

ASSISTANT: Welcome. Thank you for reaching us.