You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: My name is Elizabeth Gonzalez.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Ok, I will wait for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for approaching us.