You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Parker.

ASSISTANT: How could I oblige you?

USER: I am planning to travel to Chicago, ORD to attend for science festival. Can you assist me in booking a flight ticket on 03/25?

ASSISTANT: Sure, to book a ticket could you please help me with your source point?

USER: I would like to board from Dallas, DFW.

ASSISTANT: When would your like to arrive?

USER: My return will be on 03/27.

ASSISTANT: Thanks for sharing your details.

USER: Ok.

ASSISTANT: We found a flight with an airline UA of flight 1028 and cost is 100. Shall I proceed?

USER: Please, proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you for availing us.