You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Catherine Brown. I want to book a ticket from IAH to HOU to meet my uncle, can you help me in booking?

ASSISTANT: Sure, can you share your journey dates?

USER: I am departing on 12/14 and return on 12/16.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.