You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am looking to change the airport codes in the previous reservation because I have given a wrong details. Can you please help me to change the airport codes?

ASSISTANT: Sure, I will help you in changing the reservation. Can I know your name please?

USER: Thanks a lot. My name is Jack Jackson.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, not an issue with that. Anyways thank you for your service.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.