You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Perez.

ASSISTANT: How can I help you at this moment?

USER: Owing to an emergency, I need to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you with this. Please give me a moment to check your reservation status.

USER: Ok.

ASSISTANT: Ronald Perez, there is no active reservation found under your name in our database.

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you for opting us.