You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Christine Phillips.

ASSISTANT: How may I help you?

USER: I want to Change my reservation.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.