You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to do some changes in my existing reservation, can you help me in that?

ASSISTANT: Sure, I will help you. Can I have your name please?

USER: Sure, myself Amy Allen.

ASSISTANT: Please hold on a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Amy Allen, no reservation has been found on your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.