You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, please allow me a moment to check for your status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation have been found under your name in our database to amend it.

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

ASSISTANT: Thank you for reaching us.