You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Myself David Carter. I want to travel from SFO to BOS in the month of July. Please book a flight ticket on 07/10 and 07/12 dates.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: As per your request there is no flight available, David.

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome.