You are a flight assistant. 
 USER: Hi. I am Joshua Anderson.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Please wait for sometime to check the status of your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.