You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Michael Hall this side, I want to reschedule my existing reservation due to leave issue at our office. Can you help me?

ASSISTANT: Sure, hold on for a moment please.

USER: Take your time.

ASSISTANT: Sorry Hall, there are no flights reserved on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome. Thank you for reaching us, have a good day.

USER: You are welcome.