You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Jeffrey Wilson. Due to some health issues, I would like to postpone my meeting. Can you change my existing reservation to some other dates?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Jeffrey, there is no reservation found under your name.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us, have a great day.