You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Can you change my reservation as I am not able to travel on my planned travel dates?

ASSISTANT: Sure, may I know your name to check in the airline reservation?

USER: Justin Allen here.

ASSISTANT: Sorry, there is no reservation found with your name in our airline database.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for opting us.