You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: I am glad to help you in changing your reservation. Can you please provide your name for checking the reservation status with your name?

USER: Thank you for your response, my name is Jeffrey King.

ASSISTANT: I feel sorry Jeffrey King, there is no active reservation with your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are welcome, thank you for the reaching us.