You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brian Wilson here.

ASSISTANT: How may I assist you?

USER: I want to travel from CLT to HOU for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Please mention your planned travel dates.

USER: My departure date is 10/13 and return date is 10/15.

ASSISTANT: Ok, please hold on for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you, there is no flight found in this route on the dates you have given.

USER: Thanks for the information.

ASSISTANT: You are welcome. Thank you for choosing us.