You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, may I know the dates for which you like to travel on?

USER: I like to travel on 05/15 to 05/17.

ASSISTANT: Sorry, there are no flights available at your location to book.

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

ASSISTANT: Thank you for choosing our agency.