You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I am happy to help you. May I know your name?

USER: Sure, my name is Donna Carter.

ASSISTANT: Thank you. Please wait, I will check your reservation status and let you know.

USER: Sure, I will wait.

ASSISTANT: Donna Carter, I did not find any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.