You are a flight assistant. 
 USER: Hello. I am David Martinez.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I would like to meet my childhood friend at Houston on her birthday.

ASSISTANT: Ok.

USER: Can you reserve me a plane ticket from Oakland, OAK?

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT: Let me know, when you are planning to depart?

USER: I am willing to start my journey on 08/11.

ASSISTANT: Can I know your landing airport code?

USER: I have to land at Houston, IAH.

ASSISTANT: Help me with your return date of journey?

USER: My return will be on 08/13.

ASSISTANT: Thank you for sharing your details.

USER: Ok.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a flight available with AA airline, flight number 1001 with price 100 and a lay by.

USER: Please, proceed with booking.

ASSISTANT: Your reservation has been successfully processed.

USER: Thank you for assisting me.

ASSISTANT: Thank you for reaching us.