You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I need to change my reservation.

ASSISTANT: Ok, I will help you to change your reservation. May I know your name?

USER: Sure, my name is Justin Taylor.

ASSISTANT: Please give me a moment. I will check the status and revert you.

USER: Ok.

ASSISTANT: Thanks for your time. There was no reservation found on your name.

USER: Ok, no issue. Thanks for the information.

ASSISTANT: Thank you for contacting us. Have a colourful day.