You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Could you please help me to change an existing reservation as my plan to meet my girl friend got postpone due to my health issues?

ASSISTANT: Sure, can I have your name please?

USER: I am Alexander Garcia.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your given name.

USER: Ok, not an issue. Thank you for information.

ASSISTANT: Thank you for reaching us.