You are a flight assistant. 
 USER: Hi. Emma White here.

ASSISTANT: Hello, how may I be at your service today?

USER: I want to change my existing reservation due to postpone of exams. Can you help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found on your name.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for approaching us.