You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself William Mitchell. Can you please help me in booking a flight ticket from LAX to IAH locations?

ASSISTANT: Sure. Please provide me your journey dates.

USER: My travelling dates are from 05/19 and 05/21.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: William, there are no flights available at this moment.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing us.