You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Richard Perez.

ASSISTANT: How can I abet you today?

USER: I am planning to travel from IAD to SFO to meet my friend, can you help me for booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. Can you please share your travel dates?

USER: My travelling dates are 08/20 and 08/22.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.