You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: My name is Jack Moore, I want to book a direct flight from Dallas to Houston to visit comic-con. Can you book a flight for me?

ASSISTANT: Sure, we are here to help you. Kindly mention your travel dates.

USER: I will fly on 07/01 and return on 07/03.

ASSISTANT: Can you please provide me your airport codes?

USER: My source airport code is TX-DFW and my destination is TX-IAH.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us, have a good day.