You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I'm Christine Gonzalez.

ASSISTANT: Hi Christine Gonzalez.

USER: Could you please help me in changing an existing reservation.

ASSISTANT: Sure, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we have not found any reservation on your given name.

USER: Thank you.

ASSISTANT: Thanks for choosing us.

USER: Have a nice day!.