You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Kathleen Roberts. Actually, I want to change an existing reservation, due to some health issue. Can you help me out?

ASSISTANT: Sorry to hear Roberts, I can help you. Please hold for a moment, I will revert you.

USER: Sure.

ASSISTANT: Thank you for your patience. As per your requested name there is booking found in our data. We are sorry Roberts.

USER: That's fine.

ASSISTANT: Thank you for your valuable time to reach us Roberts.

USER: Thank you for your help.

ASSISTANT: Take care of your health.