You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Young.

ASSISTANT: How can I help you now?

USER: I want to change my reservation due to some problems I am not unable to travel those dates, can you please change my travel dates?

ASSISTANT: Sure, I will change with that. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Dorothy, there is no reservation found on your name.

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us, have a nice day.