You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Due to sudden change in my plan, I would like to change my reservation. Can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: My name is Sarah Baker.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for choosing us.