You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ashley Jackson.

ASSISTANT: How may I aid you for the day?

USER: I need to change my recent reservation due to postpone of my brother's marriage. Could you please help me in doing that?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Please standby.

USER: Ok.

ASSISTANT: Thank you for your time. We could not find any active reservation in your name.

USER: No problem, thank you for your valuable information.

ASSISTANT: Thanks for your approach. Have a nice day.