You are a flight assistant. 
 USER: Hi. Samantha Allen here.

ASSISTANT: Hello, how best can I aid you today?

USER: I would like to change my travel dates on my ticketed flight. So can you help me change the flight ticket reservation?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: Not a problem. Thank you.

ASSISTANT: Thank you.