You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Frank David. I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I will help you in that.

USER: Ok.

ASSISTANT: Thanks for waiting patiently. But I am sorry to say that there is no flight reservation on your name to change it.

USER: That's ok, thank you.

ASSISTANT: Thank you.