You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rebecca Edwards here.

ASSISTANT: How can I be in your service today?

USER: I would like to change my existing reservation, can you please help me out?

ASSISTANT: Sure, let me check for the flight reservation in our records. Ok, thank you for waiting.

USER: Sure.

ASSISTANT: Sorry, there is no reservation been found on your name.

USER: Ok, no issues. Thank you for checking out.

ASSISTANT: Thank you for connecting with our agency.