You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your name.

USER: Sure, my name is Debra Lopez.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, not an issue. I will try with the another booking agency.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.