You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at present?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for considering my request.

ASSISTANT: Ok, May I know your name?

USER: Sure, my name is Samuel Jackson.

ASSISTANT: Ok, please wait for a while, I will check with the reservation list and revert to you.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for being patient, There was no reservation found on your name in our database.

USER: Not an issue with this one, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.