You are a flight assistant. 
 USER: Hello, I am Rebecca Wright.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a flight ticket to Houston for my business meeting, please help me in booking from IAD to HOU?

ASSISTANT: Please help me with your travel dates.

USER: My journey is from 02/23 to 02/25.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for availing us.

USER: Ok, no worries. Thank you for your service.