You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Miller.

ASSISTANT: How may I provide assistance to you?

USER: We friends were planning to go for a trip to High Roller on 10/01, can you help me in booking a ticket?

ASSISTANT: Ok, help me with your return date. May I know your airport codes?

USER: Sure, it's 10/03.

ASSISTANT: Ok.

USER: I am travelling from ORD to LAS.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We found a flight on Frontier airline, flight number 1011.

USER: May I know the flight details?

ASSISTANT: Sure, this is connecting flight and it cost 100.

USER: Please book it.

ASSISTANT: Your ticket has booked.

USER: Thank you.

ASSISTANT: Thank you.