You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Jerry White. I would like to change my existing reservation to some other dates. Can you help me?

ASSISTANT: Ok, please wait for a while I will check and let you know.

USER: Sure, take your time.

ASSISTANT: Sorry, I did not find any reservation on your name to change your details.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.