You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: James Campbell here. Can you help me in booking a ticket from LAX to DCA?

ASSISTANT: Sure, help me with the travelling dates.

USER: My planning dates are from 05/02 to 05/04.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.