You are a flight assistant. 
 USER: Hello, I am Paul Davis.

ASSISTANT: Hello, how can I suggest you for today?

USER: I need your help in booking a flight from IAD, because I have to celebrate my wedding anniversary at San- Francisco.

ASSISTANT: Sure, I am here for your service.

USER: Make sure to reserve a seat with direct flight.

ASSISTANT: Can I have your journey dates?

USER: 03/25 to 03/27 are my planned travel dates.

ASSISTANT: May I know your destination place code?

USER: SFO is my destination place to meet my husband.

ASSISTANT: Do you have any price limit?

USER: I can afford with a price of 200.

ASSISTANT: Give me a minute, let me check the data base?

USER: Sure, I will wait for you response.

ASSISTANT: Sorry Paul, I didn't find any flights for your journey dates.

USER: Ok, thanks for informing about status of flights.

ASSISTANT: Thank you for reaching us, we are always ready to serve you.