You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Could you do me a favour in changing my reservation details?

ASSISTANT: Sure, please help me with your name to search your details.

USER: My name is Gary Evans.

ASSISTANT: No reservation on your name. Sorry for inconvenience.

USER: No problem. Thanks for the information.

ASSISTANT: Thank you for choosing us, have a nice day.