You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jennifer Harris here.

ASSISTANT: Yes Harris, what can I do for you?

USER: As my manager did not approve my leave, so I want to change my existing reservation. Can you please help me?

ASSISTANT: Sure Harris, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Sorry Harris, I have searched your past reservation with the name Jennifer Harris, but there is no reservation is showing.

USER: That's ok, no problem. Thank you for the help.

ASSISTANT: You are welcome. be on connecting with us. Thank you for choosing us.