You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brandon Robinson here.

ASSISTANT: How may I assist 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: Unfortunately there is no reservation found with your given name in our data.

USER: Oh! I think the ticket was not reserved properly while at the time of my booking.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information anyways.