You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jeffrey Phillips, want to alter my recent reservation because I made my booking with wrong travelling dates. Please help me out with that.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry Phillips, I couldn't find any reservation on your name.

USER: It's ok, not an issue. Anyway, thank you for your help.

ASSISTANT: You are welcome.