You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Matthew Scott here.

ASSISTANT: Scott, how may I assist you today?

USER: Can you book a direct flight to Phoenix?

ASSISTANT: Sure, I will help you in booking, please share your airport codes?

USER: My airport codes are CLT to PHX.

ASSISTANT: When you are going to start your journey and please share your return date also?

USER: I want to reach Phoenix on 09/25 and start on 09/23.

ASSISTANT: Scott, there is no flights as per your details.

USER: That's ok I will find out with other airlines. Thank you.

ASSISTANT: It's my pleasure.