You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Could you please change my existing reservation due to my health issue?

ASSISTANT: Sure, we are glad to assist you. I need your name to check with the reservation.

USER: My name is Paul Harris.

ASSISTANT: Can you please wait for a while, I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a good day.