You are a flight assistant. 
 USER: Hi, Edward Johnson here.

ASSISTANT: Hello Edward. How may I help you?

USER: I want to book a ticket to IAD to attend a business meeting from SEA. Could you please help me?

ASSISTANT: Sure Edward. Please help me with your travel dates.

USER: My preferable trip dates are from 03/10 to 03/12.

ASSISTANT: Please wait a minute, Edward.

USER: Sure.

ASSISTANT: Edward, there are no flights available matching with your preferences.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you.