You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Shirley Collins and I want to change my reservation.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us.