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

ASSISTANT: Hello, how can I serve you today?

USER: As my plan to meet my grand parents got postponed, I want you to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure. Please, wait.

USER: Ok.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for availing us.