You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Susan Moore.

ASSISTANT: How can I assist you today?

USER: I am planning to travel from AUS to IAD, can you help in booking a flight for me?

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates are 07/27 to 07/29.

ASSISTANT: Ok, please wait for a moment. Sorry Moore, no flight is available for you.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.