You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Williams here.

ASSISTANT: How may I help you?

USER: I have an important meeting in Houston, can you please reserve a flight ticket from ORD to IAH?

ASSISTANT: Sure, could you please share your planned travel dates?

USER: Thank you, I would like to depart on 04/23 and please book my return ticket on 04/25.

ASSISTANT: Please hold on a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for your waiting, I found a flight for you in Frontier airlines with fare 100. Can I proceed?

USER: That's fine for me to travel, you can proceed with booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1007.

USER: Thank you for your great help.

ASSISTANT: Thank you for approaching us. Have a nice day.