You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patricia Jackson here.

ASSISTANT: How may I aid you today?

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: please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no active reservations found on your given name.

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

ASSISTANT: Thank you for reaching our service.