You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Frank Edwards. I need to change my existing reservation as my exams got postponed some technical issues, Can you please help me with that?

ASSISTANT: Sure, let me check the reservation list and get back to you.

USER: Sure.

ASSISTANT: We are sorry to inform you that, there is no reservation found with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for consulting us.