You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you for the day?

USER: I am Shirley Rodriguez. I want to change my existing reservation due to my exams scheduled got postponed, can you please help me with that?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no worries at all. Thanks for your help.

ASSISTANT: Thank you for contacting us.