You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you today?

USER: I am planning to go for technical tour to NASA space center on 03/04. So, can you please book a direct flight ticket to Houston, IAH?

ASSISTANT: Ok, please help me with your origin airport code.

USER: Charlotte, CLT is my boarding point.

ASSISTANT: Ok, please provide your return journey date.

USER: I intend to return on 03/06.

ASSISTANT: May I know your good name?

USER: I am Christine Rodriguez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to inform you that we did not find any flights with your requirements.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.