You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Benjamin Edwards here.

ASSISTANT: Can you please tell me how can I aid 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 changing of my reservation?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Oh! I think something went wrong due to server issue.

ASSISTANT: Most welcome.

USER: Anyway, thank you for the information.

ASSISTANT: Most welcome.