You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you at this moment?

USER: I would like to change my flight reservation as I am sick, can you please help me?

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

USER: Yes, my name is Stephanie Carter.

ASSISTANT: Ok, Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, We are sorry to say that there is no active reservation found on your name.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thanks for contacting us.