You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sharon Thompson, help me to make a flight reservation on 09/22 to Houston.

ASSISTANT: Sure, can you please share your journey points?

USER: My source airport code is Houston, HOU and destination airport code is Las Vegas, LAS.

ASSISTANT: May I know your return date please?

USER: My return date is on 09/24.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.