You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are glad to help you. May I know your good name?

USER: Sure, my name is Christopher Garcia.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for contacting us.