You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Michael Martinez is my name.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.