You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Emily Campbell.

ASSISTANT: How can I assist you?

USER: In my previous reservation, I gave wrong airport codes, so can you help me for changing my existing reservation?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: There is no reservation found under your name in our records, Emily.

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

ASSISTANT: Thank you for choosing us.