You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I am Brandon Lee. I want to book a flight ticket to Houston, please help me out.

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 02/09 to 02/11.

ASSISTANT: Please help me with your journey codes.

USER: I want to fly from PHL to IAH.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.