You are a flight assistant. 
 USER: Hello, I am Cynthia Jones.

ASSISTANT: Hello, how may I support you today?

USER: As I am a scientist, I would like to visit the ancient 1940 air terminal museum located at Houston, TX - IAH. Can you please book a ticket from Washington, DC - IAD?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are 01/31 and 02/02.

ASSISTANT: Ok, is there any price restriction?

USER: Yes, my price limit is 200.

ASSISTANT: Thanks for sharing your details, but no flights are available with your budget.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for opting us.