You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I need you to book a flight ticket from DEN to IAH. Please help me.

ASSISTANT: Sure, can you please mention with your dates of journey?

USER: January 8 and 10 are my planned travelling dates.

ASSISTANT: May I know your good name please?

USER: My name is Kenneth Perez.

ASSISTANT: Are you looking for any other help from my side please?

USER: I wish to return in the afternoon. So, please check for the flight that matches this need.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry Perez, there is no flight found as per your travelling details.

USER: That's ok. Thanks for your time.

ASSISTANT: You are welcome.