You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: My name is Kevin Green and I want to change my reservation, can you please help?

ASSISTANT: Sure, please wait for some time.

USER: Sure.

ASSISTANT: We found a reservation on your name. can you please help me with your new travelling airport codes?

USER: My new travelling airport codes are LGA to CLT.

ASSISTANT: Ok, please provide your preferred travelling dates?

USER: My travelling dates are 09/22 and 09/24.

ASSISTANT: There are no flights found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.