You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Emily Campbell, please help me to change my existing reservation because I gave wrong airport codes?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thank you.

ASSISTANT: Thanks of waiting Emily. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Oh! It's ok, no problem thank you for your services.

ASSISTANT: Thank you.