You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dorothy Evans here.

ASSISTANT: How can I help you today?

USER: Can you help me with the change of flight reservation? As I have changed my plans of visiting my grandparents at New York.

ASSISTANT: Sure, I can help you with that.

USER: Ok.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available on your name Dorothy Evans.

USER: Ok, that's not a problem.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you.

ASSISTANT: Welcome.