You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: This is Richard Clark.

ASSISTANT: How can I help you?

USER: Could you please help me to modify my reservation?

ASSISTANT: Sure Richard, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: OK, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.