You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Lee. Can you please help me to book a flight ticket from ORD to HOU?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My planned travel dates are in the month of July from 17th to 19th.

ASSISTANT: Ok, do you have any connection limit?

USER: I want a single connecting flight.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I would like to return in the evening.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.