You are a flight assistant. 
 USER: Hello. Nancy Garcia here.

ASSISTANT: Hello, how may I help you at this moment?

USER: Due to sudden change in my planned location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Please wait for a moment, I will check and get back to you. Sorry, there is no tickets showing on your name.

USER: Sure, I will wait for you response. Oh! I think the ticket was not booked properly while I am booking. Thank you for the information.

ASSISTANT: Thank you for reaching us.