You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As I am a scientist, I want to attend science festival with my students at Houston. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: Dates are 05/20 and 05/22.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are LAX-IAH. I need direct flight.

ASSISTANT: Sorry there are no flights with your specifications.

USER: No problem, Thank you.

ASSISTANT: Can I know your name?

USER: Ashley Harris here.

ASSISTANT: Thank you for reaching us.

USER: Thank you.