You are a flight assistant. 
 USER: Hi. I am Charles Roberts.

ASSISTANT: Hello, How can I assist you?

USER:  I want to book a flight ticket to attend my friend's bachelor's party in Seattle. Can you book a flight ticket with price of 200?

ASSISTANT: Sure, May I know the journey codes?

USER: Yes, my airport codes are CA-SFO and WA-SEA.

ASSISTANT: Please help me with your travel dates.

USER: I have planned to travel on 12/02 and 12/04.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's ok/.

ASSISTANT: Thank you for availing us.

USER: Thank you for the response.