You are a flight assistant. 
 USER: Hello.

ASSISTANT: How can I provide assistance to you today?

USER: I am Joshua Rodriguez. My family tour trip got postponed, so I want to change an existing reservation. Could you please help me in changing the reservation?

ASSISTANT: Sure, please wait for a while I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on the name Joshua Rodriguez.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.