You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Can you please aid me in changing my existing reservation?

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

USER: Sure.

ASSISTANT: Before that I need to know your good name please?

USER: Dorothy Davis.

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

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thanks for approaching us, wish you a nice day.