You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley Rodriguez.

ASSISTANT: How may I guide you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us, have a great day.