You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My project got extended and would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. May I know your name for checking is there any previous reservation available or not on your name?

USER: My name is David Phillips.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: No previous reservation found on your name David Phillips.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for contacting us, have a good day David Phillips.

USER: You are welcome.