You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How exactly I can serve you the best today?

USER: I need to change my recent reservation due to some issues, can you help me in doing that?

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

USER: I am Stephen Perez.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Sure, take your time.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for approaching us, wish you a nice day.