You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I want to change my airport codes in my previous reservation, can you help me with changing reservation?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Sarah Turner.

ASSISTANT: Ok, please wait for a few minutes.

USER: Ok, try to be quick.

ASSISTANT: Thank you for your time, There was no reservation found on your name to change it.

USER: Oh! That's sad to hear from you. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your assistance. Most welcome.