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

ASSISTANT: Hello, how may I be of your helping hand today?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry we did not find any reservation with your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you  for connecting with us, we hope to serve you again.

USER: Welcome.