You are a flight assistant. 
 USER: Hello, I am Thomas Parker.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my recent reservation, due to my seminar at my college has been postponed. Can you aid me to change my recent reservation?

ASSISTANT: Sure, I will assist you change your reservation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, Sorry there is no reservation found with your name in our system data.

USER: That's Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for reaching us, we hope see you again.