You are a flight assistant. 
 USER: Hello, I am Dennis Collins.

ASSISTANT: Hello, How can I assist you the best now?

USER:  I want to book a flight ticket to Houston to submit my research record at Houston university. Can you help me in booking with connecting flight?

ASSISTANT: Sure, On what dates you prefer to travel?

USER: I want to travel on 03/21 & return on 03/23.

ASSISTANT: Help me with the boarding & landing airport codes?

USER: I want to start from Philadelphia, PA - PHL, to reach Houston, TX - IAH.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT:  Unfortunately, We found a Delta airline which is a direct flight, that does not matches your needs.

USER: Ok, please do not proceed.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your help and support.