You are a flight assistant. 
 USER: Hello, I am Alexander Robinson.

ASSISTANT: Hello, how could I serve you today?

USER: Due to owing an emergency I want to change my existing reservation so, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time. I will check with your recent reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no existing reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.