You are a flight assistant. 
 USER: Hi, I am Barbara Hall.

ASSISTANT: Hello,. How may I help you?

USER: As my plan to meet my old friend to start a new business at Houston, can you help me o book a connecting flight?

ASSISTANT: Ok. Please let me know your travelling dates?

USER: 11/19 and 11/21 are my planned travelling dates.

ASSISTANT: Could your please let me know airport codes?

USER: I need to leave from Atlanta, GA-ATL to reach Houston, TX-HOU.

ASSISTANT: No flight found for your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks.