You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my flight reservation as I am unwell, please help me out.

ASSISTANT: Sure, can you please help me with your name to check?

USER: Yes, I am Ronald Jackson.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT:  I am very sorry to inform you that there is no reservation found under your name in our database.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.