You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Patrick Lopez, planning to change my existing reservation details. Can you help me?

ASSISTANT: Yes, Lopez. Please be on hold for a minute. There is no reservation on your name to do changes in it.

USER: It's ok. Thank you for your response.

ASSISTANT: It's my pleasure, thank you for choosing our service.