You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Collins here.

ASSISTANT: How may I help you?

USER: I want to book a flight ticket on the route from HOU - ORD to meet my family, can you help me?

ASSISTANT: Sure, may I know you travel dates please?

USER: I was planning to travel from 12/23 to 12/25.

ASSISTANT: Flight-1002 from Delta airlines is there for you with travel charge of 200, shall I proceed for booking?

USER: Ok, proceed with booking my reservation with this availability.

ASSISTANT: Your ticket is booked.

USER: Thank you for confirming my tickets.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.