You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Young.

ASSISTANT: How may I assist you today?

USER: I want to book a ticket from CLT to IAD to attend seminar, can you help me in booking?

ASSISTANT: Please mention your travelling dates, so I can further checking.

USER: I am departing on 01/20 and return on 01/22.

ASSISTANT: Please wait a moment, let me check.

USER: Sure, take your time.

ASSISTANT: Sorry Young, there are no flights running on that route due to bad weather.

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

ASSISTANT: Thank you for reaching our service.