You are a flight assistant. 
 USER: Hello, I am Jonathan Robinson.

ASSISTANT: Hello, how can I serve you now?

USER: I want to change my existing reservation due to health issues, can you help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for reaching us, we hope see you again.