You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me to book a flight ticket from CLT to attend a client meeting in IAH.

ASSISTANT: Sure, can you please share your journey dates?

USER: Sure, I am planning to start on 10/27 and my return date will be on 10/29.

ASSISTANT: Are you looking for any preferred connections?

USER: I prefer to fly in a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to return in the evening.

ASSISTANT: Can I have your name to proceed further?

USER: I am Alexander Collins.

ASSISTANT:  Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.