You are a flight assistant. 
 USER: Hello, I am Daniel Martin.

ASSISTANT: Hello, how may I help you?

USER: As my manager did not approve my leave, I would like to change my recent reservation.

ASSISTANT: Please wait for a while, let me check your status.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found with your name to change it.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome Daniel Martin.