You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know what kind of service you are looking for?

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

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: Thank you, I am Patricia Nelson.

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

USER: Ok, I will wait.

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

USER: No problem. Thanks for checking.

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