You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to meet my business partner at Seattle, can you please help me to book my flight ticket from IAD to SEA?

ASSISTANT: Sure, I am here to help you with that. Can you please share your travel dates?

USER: Sure, I have to depart on June 4th and also please book my return ticket on June 6th.

ASSISTANT: Do you have any specification?

USER: No, please check for the available flights and let me know.

ASSISTANT: May I know your name?

USER: My name is George Brown.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.