You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Richard Jones. Due to heavy rains cricket match got postponed, so I need to change my existing reservation. Could you please help me in doing that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Richard, no reservation is found.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.