You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure. May I know your name?

USER: Richard Carter.

ASSISTANT: Ok. Please let me check details with your recent reservation.

USER: Sure.

ASSISTANT: I regret, there is no reservation by name Richard Carter.

USER: Thank you for your information.

ASSISTANT: Thanks. Have a nice day ahead!.