You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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 that?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Thank you for accepting my request. I had reserved it on the name of Richard Campbell.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Richard Campbell, there is no active reservation found under your name to do changes in that.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.