You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in flight ticket modification that I am unable to travel on those trip dates?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name for further process.

USER: My name is Gregory Campbell.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation found in your name Gregory Campbell.

USER: Ok, thank you for your valuable time in providing the information. Thank you.

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

USER: Welcome.