You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

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

ASSISTANT: Sure, We are here to assist you. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't  found any reservation by this name.

USER: That's ok, thank you for choosing us.

ASSISTANT: Thank you for choosing us.