You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I would like to participate in a mobile food distribution event at Denver, can you help me to book a connecting flight?

ASSISTANT: Sure, can you please share your travelling dates?

USER: I will depart on 12/19 and I intend to return on 12/21.

ASSISTANT: May I know your journey airport codes?

USER: I need to start from Houston, TX-IAH to reach Denver, CO-DEN.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: We found a Frontier airline with flight number 1004 and price is 100 available according to your details.

USER: That's perfect, please reserve my ticket.

ASSISTANT: Your booking is done.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us. May I know your good name for documentation purpose?

USER: I am Thomas Lewis.

ASSISTANT: Thank you.