You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Katherine Lopez.

ASSISTANT: Ok.

USER: I have to attend a meeting in Houston, can you please book a flight ticket on these dates from 02/04 to 02/06?

ASSISTANT: Sure, will you provide your airport codes?

USER: My origin airport code is LAS and destination airport code is IAH.

ASSISTANT: Unfortunately there is no flights found under your details.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.