You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation, as my semester exams are postponed.

ASSISTANT: Ok.

USER: Will you help me in this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Frank Davis.

ASSISTANT: Please, stay online.

USER: Ok.

ASSISTANT: Thank you for your precious time, there is no active reservation found on your name.

USER: Ok, thanks for the response.

ASSISTANT: Thank you for reaching us, have a good day.