You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you today at this moment?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, on which name your ticket has been reserved?

USER: I am Patricia Lee.

ASSISTANT: Just hold on a moment.

USER: OK.

ASSISTANT: We did not find any reservation on your provided name in our data.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for opting us.