You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Andrew Martin.

ASSISTANT: How may I guide you?

USER: I have made a reservation couple of days back to a popular place in Mexico. I have decided to change my reservation now, could you please help me in doing it?

ASSISTANT: Sure, please hold on for a moment while I check for any active reservations with your name.

USER: Sure, take your finest time.

ASSISTANT: I am sorry Andrew, there are no existing reservations with your name.

USER: No issues. Thank you anyways for the information.

ASSISTANT: Thank you, have a great day ahead.