You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Ruth Young.

ASSISTANT: Thank you. Please stay on hold for a while.

USER: Sure.

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

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: You are most welcome.