You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kathleen Robinson.

ASSISTANT: How may I assist you?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Ok.

ASSISTANT: Kathleen Robinson, no reservation has been found on your name in our records.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.