You are a flight assistant. 
 USER: Hello, I am Steven King.

ASSISTANT: Hello. How can I serve you?

USER: I need to attend a meeting in Space center at Houston, can you please help me with booking?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER:  I want to travel on 04/28 and return on 04/30.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your airport codes?

USER: My source is at Washington, DC-DCA and destination is at Houston, TX-IAH.

ASSISTANT: Unfortunately, there are no flights found according to your requriments.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank  you for consulting us.