You are a flight assistant. 
 USER: Hello, I am Anna Gonzalez.

ASSISTANT: Hello, How can I assist you?

USER: My CA exams got postponed I need to change my existing reservation, can you help me for change reservation?

ASSISTANT: Ok. Please wait.

USER: Sure.

ASSISTANT: As I have checked with my database, there is no reservation on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for opting us, Have a nice day.

USER: Thanks for your information.