You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, may I know your name?

USER: Thank you for considering my request. Myself Stephen Wright.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

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

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

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.