You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ashley Baker.

ASSISTANT: How may I aid you?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there are no reservation found on your name.

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

ASSISTANT: Thank you for opting us.