You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to book a ticket from DFW to IAD to meet my uncle, can you help me in booking?

ASSISTANT: Sure, may I know your journey dates?

USER: I am departing on 10/29 and return on 10/31.

ASSISTANT: May I know your name?

USER: My name is Jonathan Lee.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.