You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you at this moment?

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 good name please?

USER: Sure, myself Carolyn Mitchell.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure, I will wait for your response.

ASSISTANT: There is no existing reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us.