You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Paul King, while booking I gave wrong airport codes in my previous reservation, so can you help me for changing an existing reservation?

ASSISTANT: Sure, I am will help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation under your name in our listings.

USER: Oh! No problem.

ASSISTANT: Ok, thank you for reaching out here.

USER: Thank you for your services.

ASSISTANT: Most welcome.