You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: I am Kevin Williams. I need to book a flight ticket on 03/25 and return on 03/27, can you help me with booking please?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, my airport codes are NC-CLT and AZ-PHX.

ASSISTANT: There is no flight on your details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.