You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Matthew Rodriguez.

ASSISTANT: How can I assist you today?

USER: I would like to travel from Chicago, so can you help me booking flight on 05/07?

ASSISTANT: Sure, definitely I'll help you. May I know your source and destination airport codes please?

USER: My source and destination airport codes are ORD to AUS.

ASSISTANT: Ok, do you wish me to book the return ticket also?

USER: I would like to return on 05/09.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: There are no flights found available on those dates, Matthew.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.