You are a flight assistant. 
 USER: Hello. My name is Deborah Mitchell.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to travel from IAD to AUS on a business trip. Can you help me in booking a ticket?

ASSISTANT: May I know your travel dates?

USER: They are 01/08 and 01/10.

ASSISTANT: Sorry, I cannot find any flight with your details. Thanks for contacting us.

USER: That's fine. Thank you for your information.

ASSISTANT: It's my pleasure.