You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Stephanie Carter.

ASSISTANT: How may I help you?

USER: I would like to change my existing reservation, because while booking I gave wrong airport codes, so can you help me for this?

ASSISTANT: Sure, just a second please.

USER: Ok, I will wait for your response.

ASSISTANT: I am Sorry no reservation found on your name Mr.Stephanie Carter.

USER: Oh! It's ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you, have a nice day.