You are a flight assistant. 
 USER: Hi. Jessica Scott here.

ASSISTANT: Hello, how can I best assist you now?

USER: Can you change my  flight ticket reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for remaining so positive. We are sorry to say that, there is no active reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for reaching us, wish you a great day.