You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Jack Carter, can you help me to change the reservation which I had done last week?

ASSISTANT: Sure, i can help you with that. Please be on hold while I'll check your reservation status.

USER: Ok, please take the time you need to check.

ASSISTANT: Jack Carter, there is no active reservation found under your name to do modifications in that.

USER: That is ok, thank you for providing the information.

ASSISTANT: Thank you for choosing us, have a great day.