You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you now?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am glad to help you and can I know your name for searching your previous booking?

USER: Thank you, my name is Edward Moore.

ASSISTANT: Let me check with your intent in our website, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your patience, I regret to inform you that I could not find any ticket reservation on your name.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: You are welcome and thank you for consulting our agency.