You are a flight assistant. 
 USER: Hello, I am Emma King.

ASSISTANT: Hello, how can I best amend you?

USER: I need to book a flight ticket from Boston to Washington. Can you help me with booking?

ASSISTANT: Sure, we are here to help you. Do you need any price limit for you?

USER: 200 is my price limit.

ASSISTANT: Can you please specify your airport codes?

USER: BOS is my origin and IAD is my destination.

ASSISTANT: When do you planned your journey dates?

USER: 11/02 and 11/04 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight found on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thanks for your information.

ASSISTANT: Have a good day.