You are a flight assistant. 
 USER: Hello, I am Linda Nelson.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket as I have meeting purpose, can you please book me a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I would like to fly on 05/01 and 05/03.

ASSISTANT: Can you please share me your airport codes?

USER: My preferable airport codes are from HOU to ORD.

ASSISTANT: Do you need any specification?

USER: I need a halt.

ASSISTANT: Unfortunately there is no flight on your details.

USER: Thant's not a problem. Thank you so much.

ASSISTANT: Thank you.