You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Larry Gonzalez here.

ASSISTANT: Larry, how can I assist you today?

USER: Can you please help me in booking a ticket from HOU to LAX?

ASSISTANT: I am here to help you, can you please tell us your journey dates?

USER: Sure, I want to depart from here on 07/28 and return by 07/30.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I'll be online.

ASSISTANT: Sorry Larry, there are no flights available to LAX on 07/28.

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

ASSISTANT: Thank you for contacting us and have a nice day.