You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, may I know how best I can help you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: I am Jonathan Martinez.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Ok.

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

USER: Its ok, thank you.

ASSISTANT: Thanks for reaching us.