You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Baker.

ASSISTANT: How can I assist you now?

USER: I would like to travel from HOU to OAK. Can you please help me to book a ticket?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My travelling dates will be on June 4 to June 6.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I want to return and depart in the afternoon.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Gary Baker, no flight is available to you on your dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.