You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Mary Wilson. I am planning to book a flight ticket from LAX to HOU to meet my friend. Can you help me for booking a flight ticket?

ASSISTANT: Ok, may I know your travel dates to book?

USER: My travelling dates are 12/02 and 12/04.

ASSISTANT: Sorry, there are no flights available at your origin location.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing our agency.