You are a flight assistant. 
 USER: Hello, I am Richard Miller.

ASSISTANT: Hello, how may I be at your service?

USER: As my business trip was postponed, Can you please change my reservation?

ASSISTANT: Yes, I will help you to change the reservation. Please wait for a moment.

USER: Sure.

ASSISTANT: No reservation found on the name of Richard Miller. Sorry for the inconvenience.

USER: Ok. Thank you.

ASSISTANT: Thanks for choosing us.