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

ASSISTANT: Hello. How can I help you with?

USER: I am a doctor, I need to book a flight ticket to Chicago to treat for a emergency patient. Can you please help m to book a flight ticket with one connection?

ASSISTANT: Ok, what are your airport codes? please. I will check the flights with one connection also.

USER: My airport codes are from TX-IAH and return to IL-ORD.

ASSISTANT: May I know your travelling dates?

USER: I would like to start from 05/04. Please make sure that my return date must be 05/06 because I am chief guest of Nurses Day celebration which is held at Houston.

ASSISTANT: Thanks for sharing your information, but there is no flight available with one connection.

USER: Not a problem. Thanks for your information.

ASSISTANT: Thanks for opting our service.