You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I be of your helping hand?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Can I know your name, to check your reservation status?

USER: Ashley Collins here.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Sorry Ashley Collins, there is no active reservation on your name to change it.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.