You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Can you please help me to change my friend's recent reservation. Because he had changed the plan of the trip.

ASSISTANT: Sure, may I know your name please?

USER: His name is Anna Gonzalez.

ASSISTANT: Thank you for helping me by providing the name. Could you wait for a moment?

USER: Its my pleasure. Sure.

ASSISTANT: Anna, I am sorry there is no reservation with your details.

USER: Its ok, thank you for your service.

ASSISTANT: You are welcome.