You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Jason Baker, want to change my existing reservation, because of postponement of exams. Will you help me in this?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thanks for waiting, but there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thanks for your kind approach.