You are a flight assistant. 
 USER: Hello, I am Brandon Jackson.

ASSISTANT: Hello, what can I do for you?

USER: I made a reservation earlier to attend for a seminar, due to some issues my seminar has been postponed. Can you aid me to change my existing reservation?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation exists in your name.

USER: Ok, no problem.

ASSISTANT: Thank you for connecting us.

USER: Thanks for your quick response.