You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: We friends have planned for a holiday trip but we are unable to arrange our budget so I want to change my reservation. can you help me with that?

ASSISTANT: Sure, may I know your good name?

USER: My name is Steven Williams.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.