You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hi, I am Brandon Brown.

ASSISTANT: How can I help you Brandon Brown?

USER: As, My manager didn't approved my leave, I want to change my reservation. Can you help me with that?

ASSISTANT: Surely, I will help you out.

USER: Thank you.

ASSISTANT: Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name to change.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for contacting us. Have a nice day.