You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change existing reservation, because I want to travel with my friends by road. Can you help me?

ASSISTANT: Ok, may I know your good name to proceed with further process?

USER: Yes, I am Amy Parker.

ASSISTANT: Sorry, there is no active reservation found by your name in our data base.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing our services, have a great day.

USER: Thank you for your information.

ASSISTANT: Most welcome.