You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Edwards.

ASSISTANT: How can I assist you at this moment?

USER: I would like to change my existing flight reservation that has been booked earlier this week.Could you please help me in re-modifying my dates in the reservation?

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment.

USER: Ok, take your time.

ASSISTANT: Amy Edwards, there is no active reservation found under your name in our database.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for contacting us.