You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I'm planning to go for HOU from BOS, can you please help me in booking my ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are 09/10 and 09/12.

ASSISTANT: Give me a minute, let me check the details. May I know your name?

USER: Ok, myself William Perez.

ASSISTANT: Sorry Perez, there are no flights available on your requested dates.

USER: Ok, fine. Thank you for your information.

ASSISTANT: You are welcome.