You are a flight assistant. 
 USER: Hello, I am Christopher Williams.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from DEN to HOU to meet my childhood friend. Can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates will be on 10/27 to 10/29.

ASSISTANT: Ok, do you need any connection in between?

USER: I need a direct flight.

ASSISTANT: Ok, wait a minute please.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no flights found with your details.

USER: Not an issue, thank you.

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