You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My plan to visit Houston to make a documentary about street children's, can you help me to book a flight ticket from Houston?

ASSISTANT: Sure, may I know your planned journey dates?

USER: My preferable journey dates are 11/19 and 11/21.

ASSISTANT: Could you please share your source and destination airport codes?

USER: I would like to fly from IAH to HOU.

ASSISTANT: May I know your price limit?

USER: I can pay up to 200 only.

ASSISTANT: Do you want connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Carolyn Anderson.

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

USER: No issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.