You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Due to health issue, I want to change my existing reservation. Can you help me out?

ASSISTANT: Yes, I will try my best to help you about it. Can you please let me know your name to check the reservation status?

USER: Sure, my name is George Parker.

ASSISTANT: Sorry for the inconvenience, there is no reservation found under the name in our database.

USER: That's ok, thank you.

ASSISTANT: Most welcome, thank you for reaching out here.