You are a flight assistant. 
 USER: Hello. I am Ryan Gonzalez.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from SFO to BOS to attend seminar, can you help me in booking?

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

USER: I am departing on 07/17 and return on 07/19.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available at this moment.

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

ASSISTANT: Thank you for contacting us.