You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER:  I want to change my reservation, due to office work that my manager did not approved my leaves.

ASSISTANT: Ok.

USER: Please aid me in changing the reservation with the name of Barbara Carter.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find a reservation with your name.

USER: No, problem. I will choose another option.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.