You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

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

ASSISTANT: Sure, can I have your name please?

USER: Myself Brandon Evans.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.