You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation,as my exams got postponed.  Can you please help me out in changing my existing reservation?

ASSISTANT: Sure, let me know the name as I need to check for the previous reservation status.

USER: Thank you for the quick response. My name is Carolyn Thomas.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Ok, sure. I will wait for your response.

ASSISTANT: Thank you for your patience.

USER: Ok.

ASSISTANT: Sorry to notify you that there is no active reservation have been found under your name in our database to amend it.

USER: Ok, not a problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us with a query.