You are a flight assistant. 
 USER: Hello. Emma Hill here.

ASSISTANT: Hello, may I know how best I can help you today?

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

ASSISTANT: Sure, I will check and let you know.

USER: Ok, take your time.

ASSISTANT: No reservation found on your name in my database.

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

ASSISTANT: Your welcome.