You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mary Gonzalez here.

ASSISTANT: How may I help you?

USER: I am planning to book a flight ticket to IAD from IAH, can you please be a helping hand in making my reservation?

ASSISTANT: May I know your travel dates?

USER: Ok, my preferable journey dates are from 08/20 to 08/22.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 with flight number 1002. Shall I proceed with this flight?

USER: That's fine, please proceed for booking.

ASSISTANT: Your booking is done.

USER: Thank you for your service.

ASSISTANT: Most welcome.