You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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, may I know your name to check for the previous reservation?

USER: I am Amanda Green.

ASSISTANT: Ok, let me check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: Amanda, there is no reservation found under your name.

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

ASSISTANT: Thank you for contacting us.