You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening, what do you need from our flight agency?

USER: I want to change my reservation because in my existing reservation the location is Houston there the temperature is 6 degree centigrade. So, I would like to do some changes in my reservation.

ASSISTANT: Ok, on which name your past ticket is reserved?

USER: Yes, my previous ticket were reserved on Ronald Jackson.

ASSISTANT: Ok, please give me a couple of seconds, I will check your reservation.

USER: Ok.

ASSISTANT: Sorry to tell you that, your name is not found in the reservation chart list.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome.