You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation which is done recently, can you please help me in this?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Can I know your name for checking?

USER: Sure, my name is Patrick Brown.

ASSISTANT: Give me a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, no problem. I will try with the another travelling agency.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your service.