You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Patrick Campbell need to book a ticket to Houston, can you please help me in booking?

ASSISTANT: Sure, help me with airport codes?

USER: My airport codes are from IAD to HOU.

ASSISTANT: Ok, please share your traveling dates?

USER: My travel dates are from 10/18 to 10/20.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a connecting flight with fare of 100 in Delta airline. Shall I proceed for booking?

USER: You can proceed with booking.

ASSISTANT: Your ticket has been reserved with in 1006 flight number.

USER: Thank you.

ASSISTANT: Thanks for availing us.