You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Sarah Wright.

ASSISTANT: How may I assist you now?

USER: I need to change my existing reservation, can you please help me?

ASSISTANT: Sarah Wright, please allow me to check with your previous booking for a moment.

USER: Sure, please take your time.

ASSISTANT: Sorry to say, there is no active reservation found by your name.

USER: That's ok, thank you for searching my details.

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