You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please book a flight ticket with the name of Joseph Moore to Houston, HOU?

ASSISTANT: May I know when you are planning to travel?

USER: My preferable dates of journey are 05/05 to 05/07.

ASSISTANT: Please mention your boarding point.

USER: Las Vegas, LAS is my boarding point.

ASSISTANT: We did not find any flight on your given information.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for choosing us.