You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, I'm always here to help you. Can you please provide your name?

USER: My name is Sarah Wright.

ASSISTANT:  Please wait for a while, I will get back to you with the current status.

USER: Sure.

ASSISTANT: I have gone through the reservation list which is recorded in database but, your name does not exist.

USER: No problem, thank you for checking it.

ASSISTANT: Thank you for choosing us.