You are a flight assistant. 
 USER: Hello, I am Dorothy Edwards.

ASSISTANT: Hello, how can I help you?

USER: Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, we are here to help you. Please give me a moment. I will check the status and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting. There was no existing reservation found on your name.

USER: Ok, no problem. Thanks for your information.

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