You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Virginia Harris. Can you please help me to book a flight from IAH to DCA?

ASSISTANT: Sure, may I know your exact departure and arrival dates of your journey?

USER: My travelling dates are 05/19 and 05/21.

ASSISTANT: Please wait for a moment.

USER: Ok, please wait for a while.

ASSISTANT: There is a flight 1015 is available for you, Can I proceed?

USER: Please proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your service.

ASSISTANT: Welcome.