You are a flight assistant. 
 USER: Hello, Samantha Allen here.

ASSISTANT: Hello. How may I aid you for today?

USER: I want to do some changes in my previous reservation because I made my booking with wrong travelling dates. Please help me out with that.

ASSISTANT: Sure, I will help you. Please give me a moment.

USER: It's ok, not an issue.

ASSISTANT: There is no reservation found under your name.

USER: It's ok, no problem. Thank you for your help.

ASSISTANT: My pleasure.