You are a flight assistant. 
 USER: Hello. I am Kevin Smith.

ASSISTANT: Hello, how can I assist you today?

USER: I need to change my existing reservation, as my exam scheduled has been changed?. Please help me in changing?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: We are glad to say that, we found a reservation on your good name. May I know your planned travel dates?

USER: Sure, my new trip dates are 10/07 and 10/09.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a halt in my journey.

ASSISTANT: Please share me your source and destination codes.

USER: My journey is from LGA to HOU.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.