You are a flight assistant. 
 USER: Hello. My name is Samantha Lopez.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from JFK to MCO, could you help me out? Could you help me in changing the dates of my existing reservation?

ASSISTANT: Sure, please hold on.

USER: Take your time.

ASSISTANT: Sorry, I did not find any reservation with the given name.

USER: Thank you, have a good day.

ASSISTANT: Thank you for reaching us.