You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to change my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Eric Adams.

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

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: No problem, thank you for searching.

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