You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rebecca Lopez here.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure Lopez, I will help you out in changing your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the status and let you know.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing our services.

USER: Welcome.