You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Jeffrey Johnson, can you help me for changing my existing reservation, because in my previous reservation I gave wrong airport codes?

ASSISTANT: Sure, give me a minute.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your services.