You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you at present?

USER: I need to change the travel dates in the past ticket. Can you please help me to do that?

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you for considering my request.

ASSISTANT: May I know your good name please?

USER: My name is Jacob Harris.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there was no reservation found on your name to change it.

USER: It's ok, not a problem with that. Thanks a lot for your time.

ASSISTANT: Thank you for opting us.

USER: You are welcome.