You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicole Taylor here.

ASSISTANT: How may I render you at this moment?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for few minutes.

USER: Sure, take your time.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Oh! I think the ticket was not booked properly at the time of my ticket booking. Anyway, thank you for the information.

ASSISTANT: Thank you for opting us.