You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: Book a direct fight from Charlotte, CLT to Houston, HOU.

ASSISTANT: Could you please provide your travelling dates?

USER: 04/26 and 04/28 are my travelling dates.

ASSISTANT: Please specify your name?

USER: Shirley Nelson is my name.

ASSISTANT: No flights found for your requirement.

USER: Ok not a problem at all. Thanks for reaching us.

ASSISTANT: Thank you.