You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Scott.

ASSISTANT: How can I Help you?

USER: I want to change my reservation due to prepone of my business meeting at Houston. Will you modify my recent reservation?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there is no reservation found with your name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us. Have a good day.