You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation due to health problem. Can you help me?

ASSISTANT: Sure, I can help you with that. May I know your name to check for the previous reservation?

USER: Myself Raymond Gonzalez.

ASSISTANT: Please allow me a moment while I check for the availability of flight.

USER: Ok.

ASSISTANT: Your patience is greatly appreciated. Raymond, there is no reservation found under your name.

USER: No problem. Thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.