You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I respond to your request?

USER: I need few changes in my existing reservation, can you please help me out?

ASSISTANT: Sure, I can change your reservation right now. Please share me you good name to check reservation?

USER: Thanks you, my name is Patrick Garcia.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Unfortunately, there is no active reservation found on your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thanks for consulting us, have a nice day.