You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you today?

USER: I am Shirley Davis, looking for a connecting flight to reach Houston.

ASSISTANT: Ok.

USER: Can you please help me in booking the ticket on 02/18?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your airport codes please?

USER: Sure, I will start from IAH to return from HOU.

ASSISTANT: May I know your return date please?

USER: 02/20 is my arrival date.

ASSISTANT: Ok, please wait. Thanks for your time.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your specifications.

USER: Ok, I will choose other airline. Thank you for your quick response.

ASSISTANT: Thank you for reaching us, have a good day.