You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What kind of help are you looking from my end?

USER: I want to change my existing reservation due to postpone of my exams, can you help me with that?

ASSISTANT: Sure, we are here to help with that.

USER: Thank you.

ASSISTANT: Please share your good name.

USER: My name is Jeffrey Green.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.