You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I have postponed my trip, so please help me to change my existing reservation.

ASSISTANT: Sure, I can help you with that. Please allow me a moment to check the details.

USER: Sure.

ASSISTANT: May I know your name to proceed further?

USER: My name is Carolyn Brown.

ASSISTANT: Thank you for providing. Carolyn, I have checked and see that there is no reservation found under your name.

USER: It's ok, thank you for searching for the existing reservation with my details.

ASSISTANT: You are welcome. Thank you for contacting us.

USER: You are welcome.