You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Collins.

ASSISTANT: How can I aid you?

USER: I need to book a ticket to meet my aunt and uncle on 25th anniversary day.

ASSISTANT: Good to hear that.

USER: Could you please help me in booking a ticket from IAH to IAD?

ASSISTANT: Sure, help me with the travelling dates.

USER: My travelling dates are 06/15 and return on 06/17.

ASSISTANT: Give me a minute. Sorry, there is no flight on your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.