You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Margaret Thompson. I want to book a flight ticket.So, can you book a direct flight?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are 05/14 and 05/16.

ASSISTANT: May I know your airport codes that you wish to board and land?

USER: My airport codes are IAH and LAS.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.