You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Debra Gonzalez, I want to change my existing reservation due to some personal problems. Will you help me in that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: No problem, Thank you.

ASSISTANT: Thank you for choosing us.