You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Can you help me to change my recent reservation?

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

USER: Thank you. The ticket is under the name Samuel Nelson.

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

USER: Sure, I will wait.

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

USER: That's fine, not an issue. Anyway thank you for checking.

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