You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER:  I want to book a flight ticket to Houston, to submit my research record at Houston university. Can you assist me in booking?

ASSISTANT: Sure, May I know the journey codes?

USER: My Origin is AZ - PHX, Phoenix. Destination is Houston, TX - HOU.

ASSISTANT: Please help me with your trip dates.

USER: I want to move on 08/17, and return on 08/19.

ASSISTANT: Can I get your name?

USER: Benjamin Nelson.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem at all. Thank you for assisting me.

ASSISTANT: Thank you for opting us.