You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I aid you today?

USER: As my plan to visit my grand parents house got postponed, I need to change my reservation. Can you help me with that?

ASSISTANT: May I know your name please?

USER: I am Elizabeth Phillips.

ASSISTANT: Just hold on a minute, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform, there is no reservation found with your given name.

USER: It's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.