You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can i help you today?

USER: I am planning to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, can I have your name please?

USER: My name is Steven Rodriguez.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for reaching us.