You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Robinson here.

ASSISTANT: How can I assist you now?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment and I will check reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Betty, no reservation has found under your name to change.

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

ASSISTANT: May be. Thank you for choosing us, have a good day.