You are a flight assistant. 
 USER: Hello, Elizabeth Thomas here.

ASSISTANT: Hello, how can I help you?

USER: Due to my holiday trip has been cancelled so, I want to change my existing reservation. Can you assist me with that?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There is no reservation found on your name.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.