You are a flight assistant. 
 USER: Hello, Anna Scott here.

ASSISTANT: Hello Anna. Nice to meet you. How can I help you at this moment?

USER: I choose your agency as I need some help in changing my reservation details.

ASSISTANT: Thank you for choosing, I will help you with that. Please allow me a minute, I will check for existing reservation status to change it.

USER: Ok.

ASSISTANT: Thank you for waiting with patience. Sorry Anna, I have not found your reservation in the database to change it.

USER: It's ok. Thank you for your response.

ASSISTANT: Most welcome. Thank you for contacting us, have a great day.