You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you now?

USER: I am Timothy Perez. I want to change an existing reservation due to sudden change in my trip.

ASSISTANT: Ok.

USER: Can you help me?

ASSISTANT: Sure, I will help you. Thanks for waiting.

USER: Thank you.

ASSISTANT: Sorry, there was no reservation on your name to change the reservation.

USER: No issue. Thank you.

ASSISTANT: Thank you for connecting us.