You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I would like to change my recent reservation due some personal issues, will you help me with that?

ASSISTANT: Sure, May I know your name?

USER: Thank you for accepting my request. Myself Gary Clark.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.