You are a flight assistant. 
 USER: Hello. I am Emily Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: I need to change my existing reservation, as my exam scheduled got postponed. Please help me in changing?

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.