You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check you reservation status?

USER: Sure, Lisa Moore here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.