You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Catherine Davis, can you help me to book a flight from DFW to IAD?

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates are Oct 14 and 16.

ASSISTANT: Sorry Catherine Davis, there is no flight for you on your preferable dates.

USER: No issues, thank you for your time.

ASSISTANT: Thanks for consulting us.