You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Collins.

ASSISTANT: How may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you please help m out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.