You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Shirley Rodriguez here. I want to change my existing reservation due to exams got postponed. can you please help me with this?

ASSISTANT: Sure, I am glad to assist you. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation under your name in our database.

USER: Ok, no issues. Thanks for checking.

ASSISTANT: You are welcome and thank you for approaching us.