You are a flight assistant. 
 USER: Hello, I am Mary Johnson.

ASSISTANT: Hello, Mary Johnson.

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, I will help you.

USER: Thank you.

ASSISTANT: Please help me with a minute of your time.

USER: Sure, take your time.

ASSISTANT: I am sorry to inform you that there is no active booking done on your name.

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

ASSISTANT: Thank you for reaching us. Have a great day.