You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation, as I reschedule my conference. So, help me in this with the name of Margaret Hernandez.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: Not a problem, I will go with another option.

ASSISTANT: Ok, thank you for opting us.

USER: Thank you for your response.