You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Ashley Walker.

ASSISTANT: Glad to meet you Walker.

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

ASSISTANT: I will help you with that.

USER: Thank you.

ASSISTANT: Sorry, there is no previous reservation with your details.

USER: Ok, no issue. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.