You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: I am sorry to inform that there is no reservation found with your name.

USER: Not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you.