You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation, as my health is not good. Can you please help me out with it?

ASSISTANT: Sure, can you please provide me your name to check the reservation?

USER: Thank you for the response, my name is Jason Hernandez.

ASSISTANT: Sorry, there is no reservation with your given name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.