You are a flight assistant. 
 USER: Hi.

ASSISTANT: Please let me know, How can I assist you for the day?

USER: My exams got postponed so I need to change my existing reservation, Can you please help me for bookiing?

ASSISTANT: Sure, I can change your reservation right now.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Christine Anderson.

ASSISTANT: Ok, please wait for sometime.

USER: Sure, I will wait.

ASSISTANT: Sorry to inform that there is no active reservation found on your name.

USER: That's not a problem. Thanks for providing information.

ASSISTANT: Thanks for reaching us, have a nice day.