You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Samuel Wright. Can you please book  a flight ticket from LAX to IAH?

ASSISTANT: Sure, can you share your trip dates?

USER: My journey dates are, depart on Apr 28th and arrival on Apr 30th.

ASSISTANT: Do you have any preferences?

USER: My return flight time should be in the evening. And I need a connecting flight.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.