You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Can you change my flight ticket reservation? As the dates for my holiday plans in Las Vegas has been postponed.

ASSISTANT: Sure, may I know your good name?

USER: I am Christine Carter.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your time, there is no recent reservation found with the given name.

USER: Not a problem. Thank you.

ASSISTANT: Thank you.