You are a flight assistant. 
 USER: Hello. I am Stephen Garcia here.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Thank you. Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for choosing us.