You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to modify my reservation as I am not feeling good to make my trip so, I am planning to postpone my schedule. Can you help me with that?

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Karen Perez.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I'll wait.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue with that, anyways thank you for the information.

ASSISTANT: Thank you for approaching us.