You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

USER: I am Catherine Williams. I want to change my existing reservation.Can you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute, I will check the status on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.