You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I will help you. May I know your name?

USER: My name is Linda Adams.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: Thanks for your kind service.

ASSISTANT: Thank you for contacting us.