You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I'm Gregory Martinez.

ASSISTANT: Ok.

USER: As my manager didn't grant my leaves, I want to change my trip dates. Can you please help me with that?

ASSISTANT: Sure, I will help you with that. Sorry, there is no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.