You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to some problem at my home, can you please help me in this?

ASSISTANT: Sure, I am here to help you. Can you help me with your name?

USER: Sure, my name is Alexander Gonzalez.

ASSISTANT: Sorry to say, no reservation found on your name.

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

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Anyways, thank you for your service.