You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Hall here.

ASSISTANT: How may I help you?

USER: Can you book a flight ticket from HOU to ORD?

ASSISTANT: May I know your trip dates?

USER: My trip dates are 05/20 and 05/22.

ASSISTANT: Sorry Rachel Hall, there is no flight for you.

USER: It's ok, thanks for your information.

ASSISTANT: Welcome, have a good day.