You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Deborah White here.

ASSISTANT: How may I aid you?

USER: I would like to celebrate my birthday at Las Vegas, please help me in booking a ticket from HOU to LAS.

ASSISTANT: Sure, we are mirthful to help you. Can you please help me with your travelling dates?

USER: My planned journey dates are on Mar 25 and Mar 27.

ASSISTANT: Do you prefer any break in between journey?

USER: Yes, I need a connecting flight.

ASSISTANT: At what time would you like to depart and return?

USER: I would like to depart and return in the evening.

ASSISTANT: May I know your class preference?

USER: Any class is comfortable for me.

ASSISTANT: Is there any other specifications to be met?

USER: No more specifications.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.