You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a direct flight, could you please help me with booking a flight ticket with my requirement?

ASSISTANT: Can you share your trip codes?

USER: My source airport code is IAH and destination airport code is MSP.

ASSISTANT: What are your trip dates?

USER: I would like to depart on Oct 11th and return on Oct 13th.

ASSISTANT: Do you have any other preferences?

USER: I have no other preferences.

ASSISTANT: May I know your name?

USER: I am William Walker.

ASSISTANT: Sorry, there is no flights found with your details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.