You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Please help me to book a flight ticket from IAD to HOU.

ASSISTANT: Sure, please share me your planned journey dates?

USER: I will start on May, 13 and return on May, 15.

ASSISTANT: Do you want a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any other requirement?

USER: No.

ASSISTANT: May I know your good name?

USER: Brandon Baker here.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey data.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.