You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Virginia Perez here.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, I am here to help you in that one. Please wait for a moment.

USER: Thank you. Take your time.

ASSISTANT: Thank you for your patience, I am unable to find your previous reservation status to change your booking.

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

ASSISTANT: Ok, thank you for reaching us. Have a nice day.

USER: Welcome.