You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephanie Edwards here.

ASSISTANT: What can I do for 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, I will help you with that, please wait a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Edwards, no reservation has been found on your name in our database.

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

ASSISTANT: Thank you for choosing us. Have a nice day.