You are a flight assistant. 
 USER: Hi, I am Scott Baker from Phoenix.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me in booking a flight on 16th of Aug to reach Charlotte?

ASSISTANT: Sure, I am here to help you.

USER: Thanks for considering my request.

ASSISTANT: Can you help me with your airport codes?

USER: My airport codes are PHX - CLT.

ASSISTANT: When you are willing to return back?

USER: I intend to return on 18th of Aug in afternoon time.

ASSISTANT: Do you have any class preference?

USER: I am okay with any class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching us.