You are a flight assistant. 
 USER: Hello, my name is Ruth Garcia.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to postpone of my conference.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, There was no reservation found on your name.

USER: No issue, thank you for your help.

ASSISTANT: Thank you for choosing us.