You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Lisa Parker. Owing an emergency want to change my reservation, can you help me with it please?

ASSISTANT: Lisa Parker, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you, there is no reservation found by your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing our services. Have a great day ahead.