You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have planned to consult a doctor for monthly check up due to more emergency operations scheduled to him my appointment has been changed. Could you please help me with changing my existing reservation?

ASSISTANT: Sure, I am here to help you out. Can I have your name please?

USER: My name is Betty Hernandez.

ASSISTANT: Betty Hernandez, we haven't found any reservation under your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.