You are a flight assistant. 
 USER: Hello. I am Barbara Smith.

ASSISTANT: Hello, how may I render you?

USER: I need to book a ticket with fare of 5000 from Chicago. Could you please help me in booking a ticket to Austin?

ASSISTANT: Sure, please share me your airport codes?

USER: My airport codes are ORD and AUS.

ASSISTANT: Mention your travelling dates?

USER: My travelling dates are 11/05 and return on 11/07.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.