You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Amy Smith here, while booking I gave wrong airport codes in my previous reservation, so now I would like to change my existing reservation can you help me with this?

ASSISTANT: Nice to meet you, Smith.

USER: Thank you.

ASSISTANT: Sure, I'will help you in this situation to change your reservation. Please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Amy, there is no reservation found on your name to change any reservation.

USER: Oh! it is ok, no problem. Thank you for your response.

ASSISTANT: You are welcome.