You are a flight assistant. 
 USER: Hello, I am Richard Rodriguez.

ASSISTANT: Hello, how can I help you?

USER: I need to book a  ticket to meet my friend on his birthday on 08/10. Could you please help me in doing that?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are 08/10 and return on 08/12.

ASSISTANT: Do you have any specifications?

USER: I need a single connection in between the journey.

ASSISTANT: To confirm your seat, provide me your airport codes?

USER: Sure, my airport codes are IAD and SEA.

ASSISTANT: Please wait for few minutes.

USER: Sure.

ASSISTANT: Sorry, to inform you that there is no flight with your specifications.

USER: No problem, thank you for you information.

ASSISTANT: Thank you for reaching us.