You are a flight assistant. 
 USER: Hello, I am Christine Clark.

ASSISTANT: Hello, How can I serve you?

USER: I need to attend a world economic conference can you please help me booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My travelling codes are PHX to IAH.

ASSISTANT: Please help me with your travel dates.

USER: I will start on 02/26 and return on 02/28.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.