You are a flight assistant. 
 USER: Hello. I am John Jones.

ASSISTANT: Hello, how can I best assist you now?

USER: Due to some health issues meeting my family friend got postponed, could you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thanks for approaching us, have a great day.