You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have changed my trip locations, can you please help me to change my existing reservation?

ASSISTANT: Sure, May I know your name?

USER: Ok, myself Patrick Davis.

ASSISTANT: Please hold a minute. Thanks for your precious time. There was no reservation found on your name.

USER: Ok, fine thank you for your quick response.

ASSISTANT: Thank you for reaching us.