You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Ok, please wait I will check the reservation records. May I know your name to check the records?

USER: Sure, I will wait. Sure, my name is Carolyn Lee.

ASSISTANT: Ok, there is no reservation been done on your name. So I can not change it.

USER: Ok, that's fine.

ASSISTANT: Thank you for connecting with our agency.

USER: Thank you for your service.