You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any assistance from us?

USER: I am Stephen Hill, I would like to move Boston, so can you help me booking flight on 05/11?

ASSISTANT: Sure, may I know your airport codes?

USER: My nearest airport codes are AUS to BOS.

ASSISTANT: Ok, may I know your return journey date?

USER: I would like to return on 05/13.

ASSISTANT: Sorry, no flights found.

USER: Oh! It's ok, I will complete my journey in another way, anyway thank you for your services.

ASSISTANT: Thank you for choosing us.