You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Timothy Scott. I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I am glad to help you in changing the ticket details.

USER: Thank you.

ASSISTANT: May I know your good name to search the ticket status please?

USER: I have already mentioned above.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, I have not found any reservation on your name in our database.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome. Thank you for reaching our travel agency.