You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Pamela Martin.

ASSISTANT: How may I assist 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: Please wait a moment, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Sorry Pamela Martin, there is no active reservation on your name.

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

ASSISTANT: Thank you.